UC3844D 데이터 시트보기 (PDF) - ON Semiconductor

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UC3844D

High Performance Current Mode Controllers

ON Semiconductor 

UC3844, UC3845, UC2844, UC2845

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 SOIC−14 package.

=

Sink Only

Positive True Logic

Figure 16. Representative Block Diagram

Vin

Q1

RS

Capacitor CT

Latch

‘‘Set’’ Input

Output/

Compensation

Current Sense

Input

Latch

‘‘Reset’’ Input

Output

Large RT/Small CT

Figure 17. Timing Diagram

Small RT/Large CT

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