MC33025 데이터 시트보기 (PDF) - Motorola => Freescale
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MC33025 Datasheet PDF : 20 Pages
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MC34025 MC33025
Figure 18. Representative Block Diagram
VCC
Vin
16
Vref
4
Clock
5
RT
CT
6
Ramp 7
Error Amp Output
3
2
Noninverting Input
Inverting Input
1
8
Soft–Start
CSS
Reference
Regulator
4.2 V
Oscillator
PWM
1.25 V Comparator
Error
Amp
+
9.0 µA
Vref
UVLO
R
Q
S
PWM Latch
VCC
UVLO
9.2 V
Q
T
Q
Steering
Flip Flop
Current
Limit
R
Q
0.5 V
S
Soft–Start Latch
Shutdown
15
VCC
13
VC
14
Output B
11
Output A
12
Power Ground
1.0 V
9
Current Limit/
Shutdown
1.4 V
10
Ground
CT
Clock
Soft–Start
Error Amp Output
Ramp
PWM
Comparator
Output A
Output B
Figure 19. Current Limit Operating Waveforms
MOTOROLA ANALOG IC DEVICE DATA
7
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