NCP1205(2002) Ver la hoja de datos (PDF) - ON Semiconductor

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componentes Descripción

Fabricante

NCP1205
(Rev.:2002)

Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback

ON Semiconductor 

NCP1205

Startup

HV 1

Over Voltage

Protection (VCC > 40 V)

Last Pulse of Demag

after 4 µs

Internal VCC

Internal Regulator

UVLOH = 15 V

UVLOL = 7.2 V

8 VCC

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

7 DRV

Clock

R Flip–Flop Q

D

Driver

6 Isense

Current Comparator

200 ns L.E.B

5 Gnd

1V

Verr

VCO Feedback

Toff = f (Verr)

Max Toff = f (Ct)

VCC Pin 8

35 V Zener

OVP

18 k

2.8 V

+

–

Figure 3. Internal Circuit Architecture for DIP8 Version

http://onsemi.com

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