NCP1205 데이터 시트보기 (PDF) - ON Semiconductor

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NCP1205

Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback

ON Semiconductor 

NCP1205

VCC Pin 13

Startup

HV 1

NC 2

Last Pulse of Demag

after 4 ms

Internal VCC

Internal Regulator

UVLOH = 15 V

UVLOL = 7.2 V

14

13 VCC

Demag 3

FB 4

Ct 5

OVP 6

NC 7

DEMAG ?

Rf

Internal Clamp

Verr Max = 3 V

Ri

−

Verr Min = 10 mV OVP

+

1/3

Clock

R Flip−Flop Q

+

−

2.5 V

D

Current Comparator

Driver

200 ns L.E.B

Over Current

Protection (OCP)

V(−) < 1.5 V

+

−

Lasts more than 128 ms?

−−> Protection Circuitry

1V

Verr

VCO Feedback

Toff = f (Verr)

Max Toff = f (Ct)

OVP

2.0 k

2.8 V

+

−

12 DRV

11 Isense

10 GND

9 NC

8 NC

18 k

Figure 4. Internal Circuit Architecture for PDIP−14 Version

http://onsemi.com

5

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