NCP1205 Просмотр технического описания (PDF) - ON Semiconductor

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производитель

NCP1205

Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback

ON Semiconductor 

NCP1205

Startup

HV 1

Last Pulse of Demag

after 4 ms

Internal VCC

Internal Regulator

UVLOH = 15 V

UVLOL = 7.2 V

Demag 2

Ri

FB 3

Ct 4

DEMAG ?

Rf

Verr Max = 3 V

−

Verr Min = 10 mV

+

1/3

+

−

2.5 V

Over Current

Protection (OCP)

V(−) < 1.5 V

+

−

Lasts more than 128 ms?

−−> Protection Circuitry

Internal Clamp

Clock

R Flip−Flop Q

D

Driver

Current Comparator

200 ns L.E.B

1V

Verr

VCO Feedback

Toff = f (Verr)

Max Toff = f (Ct)

OVP

2.8 V

+

−

8 VCC

7 DRV

6 Isense

5 GND

18 k

Figure 3. Internal Circuit Architecture for PDIP−8 Version

http://onsemi.com

4

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