Материал: MJW16206
MJW16206
DYNAMIC DESATURATION
DYNAMIC DESATURATION
The SCANSWITCH series of bipolar power transistors are specifically designed to meet the unique requirements of horizontal deflection circuits in computer monitor applications. Historically, deflection transistor design was focused on minimizing collector current fall time. While fall time is a valid figure of merit, a more important indicator of circuit performance as scan rates are increased is a new characteristic, ªdynamicdesaturation.º In order to assure a linear collector current ramp, the output transistor must remain in hard saturation during storage time and exhibit a rapid turn±off transition. A sluggish transition results in serious consequences.
As the saturation voltage of the output transistor increases, the voltage across the yoke drops. Roll off in the collector current ramp results in improper beam deflection and distortion of the image at the right edge of the screen. Design changes have been made in the structure of the SCANSWITCH series of devices which minimize the dynamic desaturation interval. Dynamic desaturation has been defined in terms of the time required for the VCE to rise from 1.0 to 5.0 volts (Figures 13 and 14) and typical performance at optimized drive conditions has been specified. Optimization of device structure results in a linear collector Current ramp, excellent turn±off switching performance, and significantly lower overall power dissipation.
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tfi |
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(VOLTS) |
5 |
90% IC(pk) |
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VCE |
VOLTAGE |
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10% IC(pk) |
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IC |
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3 |
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VCE = 20 V |
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EMITTER- |
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0 |
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tsv |
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COLLECTOR |
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0 |
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1 |
0% IB |
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0 |
Figure 13. Deflection Simulator Switching
Waveforms From Circuit in Figure 15
VCE
DYNAMIC DESATURATION TIME
IS MEASURED FROM VCE = 1 V
TO VCE = 5 V
tds
TIME (ns)
Figure 14. Definition of Dynamic
Desaturation Measurement
6 |
Motorola Bipolar Power Transistor Device Data |
EMITTER±BASE TURN±OFF ENERGY
Typical techniques for driving horizontal outputs rely on a pulse transformer to supply forward base current, and a turn±off network that includes a series base inductor to limit the rate of transition from forward to reverse drive. An alternate drive scheme has been used to characterize the SCANSWITCH series of devices (see Figure 15). This circuit produces a ramp of base drive, eliminating the heavy overdrive at the beginning of the collector current ramp and underdrive just prior to turnoff produced by typical drive strategies. This high performance drive has two additional impor-
MJW16206
tant advantages. First, the configuration of T1 allows LB to be placed outside the path of forward base current making it unnecessary to expend energy to reverse current flow as in a series base inductor. Second, there is no base resistor to limit forward base current and hence no power loss associated with setting the value of the forward base current. The process of generating the ramp stores rather than dissipates energy. Tailoring the amount of energy stored in T1 to the
amount of energy, EB(off), that is required to turn±off the output transistor results in essentially lossless operation. [Note:
B+ and the primary inductance of T1 (LP) are chosen such that 1/2 LP Ib2 = EB(off)].
+ 24 V |
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U2 |
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MC7812 |
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R13 |
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R14 |
C7 |
Q2 |
R16 |
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VI |
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VO |
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430 |
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1K |
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150 |
110 pF |
MJ11016 |
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+ C1 |
GND |
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(IB) |
R1 |
R5 |
(IC) |
Q5 |
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100 μF |
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1K |
1K |
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MJ11016 |
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Q6 |
+ C3 |
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2N5401 |
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3.9 V |
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10 μF |
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+ C2 |
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C6 |
+ |
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10 μF |
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R7 |
R8 |
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R9 |
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Q3 |
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100 μF |
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R17 |
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2.7K |
9.1K |
470 |
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MTP3055E |
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LY |
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MDC1000A |
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120 |
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C4 |
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C5 |
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D2 |
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0.005 |
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0.1 |
R15 |
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SCANSWITCH |
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CY |
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7 |
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6 |
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10K |
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DAMPER |
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OSC |
VCC |
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DIODE |
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R3 |
8 % |
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OUT 1 |
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V |
250 |
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LB |
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CE |
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T1 |
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GND |
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U1 |
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Q4 SCANSWITCH |
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R6 |
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MC1391P |
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HORIZ OUTPUT |
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2 |
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TRANSISTOR |
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R12 |
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1K |
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D1 |
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R4 |
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470 |
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MUR110 |
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22 |
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1 W |
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T1: FERROXCUBE POT CORE #1811P3C8 |
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LB = 0.5 μH |
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T1: PRIMARY SEC. TURNS RATIO = 13:4 |
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CY = 0.01 μF |
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T1: GAPPED FOR LP = 30 μH |
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LY = 13 μH |
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Figure 15. High Resolution Deflection Application Simulator
Motorola Bipolar Power Transistor Device Data |
7 |
MJW16206
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ts and tf |
+15 |
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1 |
F |
150 |
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100 |
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100 μF |
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μ |
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Ω |
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Ω |
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MTP8P10 |
MTP8P10 |
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V(off) adjusted |
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MPF930 |
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RB1 |
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to give specified |
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off drive |
+10 V |
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A |
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MPF930 |
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50 Ω |
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MUR105 |
MTP12N10 |
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VCC |
250 V |
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IC |
6.5 A |
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500 |
μF |
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MJE210 |
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IB1 |
1.3 A |
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150 Ω |
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1 μF |
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IB2 |
Per Fig. 17 & 18 |
Voff |
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RB1 |
7.7 Ω |
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RL |
38 Ω |
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A |
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T.U.T. |
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*IC |
RL |
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*IB |
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VCC |
Figure 16. Resistive Load Switching
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10 |
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1000 |
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7 |
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700 |
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5 |
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500 |
( μs) |
3 |
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IB2 = IB1 |
(ns) |
300 |
t, TIME |
2 |
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t, TIME |
200 |
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1 |
IC/IB1 = 5 |
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IB2 = 2 (IB1) |
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TC = 25°C |
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100 |
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0.7 |
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70 |
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0.5 |
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50 |
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1 |
2 |
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10 |
20 |
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IC, COLLECTOR CURRENT (AMPS) |
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IB2 = IB1 |
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IC/IB = 5 |
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IB2 = 2 (IB1) |
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TC = 25°C |
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1 |
2 |
3 |
5 |
7 |
10 |
20 |
IC, COLLECTOR CURRENT (AMPS)
Figure 17. Typical Resistive Storage Time |
Figure 18. Typical Resistive Fall Time |
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Motorola Bipolar Power Transistor Device Data |
MJW16206
TEST CONDITIONS FOR ISOLATION TESTS*
MOUNTED |
MOUNTED |
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FULLY ISOLATED |
FULLY ISOLATED |
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PACKAGE |
PACKAGE |
0.099º MIN |
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LEADS |
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LEADS |
HEATSINK |
0.110º MIN |
Figure 19. Screw or Clip Mounting Position for Isolation Test Number 1
HEATSINK |
Figure 20. Screw or Clip Mounting Position for Isolation Test Number 2
* Measurement made between leads and heatsink with all leads shorted together.
MOUNTING INFORMATION**
4±40 SCREW |
CLIP |
PLAIN WASHER
HEATSINK
COMPRESSION WASHER
NUT |
HEATSINK |
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Figure 21. Typical Mounting Techniques*
Laboratory tests on a limited number of samples indicate, when using the screw and compression washer mounting technique, a screw torque of 6 to 8 in . lbs is sufficient to provide maximum power dissipation capability. The compression washer helps to maintain a constant pressure on the package over time and during large temperature excursions.
Destructive laboratory tests show that using a hex head 4-40 screw, without washers, and applying a torque in excess of 20 in . lbs will cause the plastic to crack around the mounting hole, resulting in a loss of isolation capability.
Additional tests on slotted 4-40 screws indicate that the screw slot fails between 15 to 20 in . lbs without adversely affecting the package. However, in order to positively ensure the package integrity of the fully isolated device, Motorola does not recommend exceeding 10 in . lbs of mounting torque under any mounting conditions.
** For more information about mounting power semiconductors see Application Note AN1040.
Motorola Bipolar Power Transistor Device Data |
9 |
MJW16206
PACKAGE DIMENSIONS
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NOTES: |
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±T± |
1. |
DIMENSIONING AND TOLERANCING PER ANSI |
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±Q± |
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Y14.5M, 1982. |
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E |
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0.25 (0.010) M T |
B |
M |
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2. |
CONTROLLING DIMENSION: MILLIMETER. |
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±B± |
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C |
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MILLIMETERS |
INCHES |
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4 |
DIM |
MIN |
MAX |
MIN |
MAX |
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A |
20.40 |
20.90 |
0.803 |
0.823 |
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U |
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L |
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B |
15.44 |
15.95 |
0.608 |
0.628 |
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C |
4.70 |
5.21 |
0.185 |
0.205 |
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A |
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D |
1.09 |
1.30 |
0.043 |
0.051 |
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R |
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E |
1.50 |
1.63 |
0.059 |
0.064 |
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F |
1.80 |
2.18 |
0.071 |
0.086 |
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1 |
2 |
3 |
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G |
5.45 BSC |
0.215 BSC |
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H |
2.56 |
2.87 |
0.101 |
0.113 |
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J |
0.48 |
0.68 |
0.019 |
0.027 |
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±Y± |
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K |
15.57 |
16.08 |
0.613 |
0.633 |
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K |
P |
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L |
7.26 |
7.50 |
0.286 |
0.295 |
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P |
3.10 |
3.38 |
0.122 |
0.133 |
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Q |
3.50 |
3.70 |
0.138 |
0.145 |
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R |
3.30 |
3.80 |
0.130 |
0.150 |
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F |
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H |
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U |
5.30 BSC |
0.209 BSC |
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V |
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V |
3.05 |
3.40 |
0.120 |
0.134 |
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J |
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D |
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STYLE 3: |
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0.25 (0.010) M |
Y |
Q S |
G |
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PIN 1. BASE |
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2. COLLECTOR |
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3. EMITTER |
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4. COLLECTOR |
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CASE 340F±03
TO±247AE
ISSUE E
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. ªTypicalº parameters can and do vary in different applications. All operating parameters, including ªTypicalsº must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and 
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
How to reach us: |
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USA / EUROPE: Motorola Literature Distribution; |
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P.O. Box 20912; Phoenix, Arizona 85036. 1±800±441±2447 |
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INTERNET: http://Design±NET.com |
51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852±26629298 |
◊ MJW16206/D
*MJW16206/D*