NCP1205(2002) 查看數據表（PDF） - ON Semiconductor

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NCP1205
(Rev.:2002)

Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback

ON Semiconductor 

NCP1205

VCC Pin 13

Startup

HV 1

NC 2

Over Voltage

Protection (VCC > 40 V)

Last Pulse of Demag

after 4 µs

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

12 DRV

11 Isense

10 Gnd

Over Current

Protection (OCP)

V(–) < 1.5 V

+

–

1V

Verr

VCO Feedback

Toff = f (Verr)

Max Toff = f (Ct)

VCC Pin 13

35 V Zener

9 NC

8 NC

Lasts more than 128 ms?

––> Protection Circuitry

2.0 k

OVP

18 k

2.8 V

+

–

Figure 4. Internal Circuit Architecture for DIP14 Version

http://onsemi.com

5

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