NCP1601A, NCP1601B

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3

PIN FUNCTION DESCRIPTION

Pin

Symbol

Function

Function

1

FB

Feedback /

Shutdown

for the output regulation, output Overvoltage Protection (OVP), and output undervoltage protection

(UVP).

2

Control

width typically below 20 Hz to achieve Power Factor Correction.

3

Ramp

Ramp

This pin is connected to an external capacitor to set a ramp signal. The capacitor value directly

affects the input impedance of the PFC circuit and hence the maximum input power.

4

CS

Current Sense

current is for Overcurrent Protection (OCP) and zero current detection.

modulation arrangement and by the oscillator block.

5

Osc

Oscillator /

Synchronization

In oscillator mode, this pin is connected to an external capacitor to set the oscillator frequency of

the DCM operation.

In synchronization mode, this pin is connected to an external driving signal. The positive edge of the

drive output is synchronized to the negative edge of the external signal in DCM operation.

If the inductor current is non−zero at the end of a switching period, the output drive is not allowed to

turn on. CCM operation is prohibited. Instead, the circuit operates in CRM in this case.

6

GND

The IC ground

−

7

Drv

Drive Output

This pin provides an output to an external MOSFET.

8

Supply Voltage

This pin is the positive supply of the device. The operating range is between 9 V and 18 V with

UVLO start threshold 13.75 V for NCP1601A and 10.5 V for NCP1601B.

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

Maximum Voltage Range

Maximum Current

−0.3 to +9

100

V

mA

Drive Output (Pin 7)

Maximum Voltage Range

Maximum Current Range (Note 2)

−0.3 to +18

−500 to +750

V

mA

Power Supply Voltage (Pin 8)

Maximum Voltage Range

Maximum Current

−0.3 to +18

100

V

mA

Power Dissipation and Thermal Characteristics

P suffix, Plastic Package, Case 626

Thermal Resistance, Junction−to−Air

D suffix, Plastic Package, Case 751

Thermal Resistance, Junction−to−Air

800

100

450

178

mW

°C/W

mW

°C/W

Operating Junction Temperature Range

−40 to +125

°C

Storage Temperature Range

−65 to +150

°C

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values

(not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied, damage

may occur and reliability may be affected.

A.

This device series contains ESD protection and exceeds the following tests:

Pins 1−8: Human Body Model 2000 V per MIL−STD−883, Method 3015.

Machine Model Method 200 V.

B.

This device contains Latchup protection and exceeds

±100 mA per JEDEC Standard JESD78.

1. Guaranteed by design.