UC3842A Просмотр технического описания (PDF) - Motorola => Freescale

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Компоненты Описание

производитель

UC3842A

HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER

Motorola => Freescale 

UC3842A, 43A UC2842A, 43A

Figure 17. Representative Block Diagram

VCC

VCC 7(12)

Vref

8(14)

R

2.5V

RT

R

Internal

Bias

4(7)

CT

Voltage Feedback

Input

2(3)

Output

Compensation

1(1)

Oscillator

+

1.0mA

+

–

Error

Amplifier

2R

R

Reference

+

36V

Regulator

+

VCC – +

UVLO –

3.6V + – Vref

– UVLO

TQ

–

+

1.0V

Current Sense

Comparator

S

Q

R PWM

Latch

VC

7(11)

Output

6(10)

Power Ground

5(8)

Current Sense Input

3(5)

Gnd 5(9)

+

–

Pin numbers in parenthesis are for the D suffix SO–14 package.

=

Sink Only

Positive True Logic

Vin

Q1

RS

Capacitor CT

Latch

‘‘Set’’ Input

Output/

Compensation

Current Sense

Input

Latch

‘‘Reset’’ Input

Output

Figure 18. Timing Diagram

Large RT/Small CT

Small RT/Large CT

MOTOROLA ANALOG IC DEVICE DATA

7

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