NCP1252CDR2G 查看數據表（PDF） - ON Semiconductor

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NCP1252CDR2G

Current Mode PWM Controller for Forward and Flyback Applications

ON Semiconductor 

Vbulk

NCP1252

NCP1252

1

8

Vcc

2

7

3

6

4

5

Vout

100 nF*

Table 1. PIN FUNCTIONS

Pin No.

Pin Name

1

FB

2

BO

3

CS

4

RT

5

GND

6

Drv

7

VCC

8

SSTART

*Minimum recommended

decoupling capacitor value

Figure 1. Typical Application

Function

Feedback

Brown−out input

Current sense

Timing element

−

Driver

VCC

Soft−start

Pin Description

This pin directly connects to an optocoupler collector.

This pin monitors the input voltage image to offer a Brown−out protection.

Monitors the primary current and allows the selection of the ramp com-

pensation amplitude.

A resistor connected to ground fixes the switching frequency.

The controller ground pin.

This pin connects to the MOSFET gate

This pin accepts voltage range from 8 V up to 28 V

A capacitor connected to ground selects the soft−start duration. The soft

start is grounded during the delay timer

Table 2. MAXIMUM RATINGS TABLE (Notes 1 and 2)

Symbol

Rating

Value

Unit

VCC

Power Supply voltage, Vcc pin, transient voltage: 10 ms with IVcc < 20 mA

30

V

VCC

Power Supply voltage, Vcc pin, continuous voltage

28

V

IVcc

Maximum current injected into pin 7

20

mA

Maximum voltage on low power pins (except pin 6, 7)

−0.3 to 10

V

RθJA – PDIP8

RθJA – SOIC8

TJMAX

Thermal Resistance Junction−to−Air – PDIP8

Thermal Resistance Junction−to−Air – SOIC8

Maximum Junction Temperature

Storage Temperature Range

131

169

150

−60 to +150

°C/W

°C/W

°C

°C

ESD Capability, HBM model

1.8

kV

ESD Capability, Machine Model

200

V

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

1. This device series contains ESD protection and exceeds the following tests: Human Body Model 1800 V per JEDEC Standard

JESD22−A114E. Machine Model Method 200 V per JEDEC Standard JESD22−A115A.

2. This device contains latch−up protection and exceeds 100 mA per JEDEC Standard JESD78.

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