NCP1601A Ver la hoja de datos (PDF) - ON Semiconductor

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componentes Descripción

Fabricante

NCP1601A

Compact Fixed Frequency Discontinuous or Critical Conduction Voltage Mode Power Factor Correction Controller

ON Semiconductor 

NCP1601A, NCP1601B

PIN FUNCTION DESCRIPTION

Pin Symbol

Function

1 FB

Feedback /

Shutdown

2 Vcontrol Control

3 Ramp

4 CS

Ramp

Current Sense

5 Osc

Oscillator /

Synchronization

6 GND

7 Drv

8 VCC

The IC ground

Drive Output

Supply Voltage

Function

This pin receives a current IFB which is proportional to the PFC circuit output voltage. The current is

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

(UVP).

When IFB goes above 107% Iref, OVP is activated and the Drive Output is disabled.

When IFB goes below 8% Iref, the device enters a low−current consumption shutdown mode.

The voltage of this pin Vcontrol directly controls the input impedance and hence the power factor of

the circuit. This pin is connected to an external capacitor to limit the control voltage Vcontrol band-

width typically below 20 Hz to achieve Power Factor Correction.

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.

This pin sources a current IS which depends on the inductor current and an offset voltage. The

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

When IS is above 200 mA, OCP is activated and the Drive Output is disabled.

When IS is below 14 mA, the circuit detects a zero current. This information is used by the on−time

modulation arrangement and by the oscillator block.

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.

−

This pin provides an output to an external MOSFET.

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

FB, Vcontrol, Ramp, CS, Osc Pins (Pins 1−5)

Maximum Voltage Range

Maximum Current

Vmax

Imax

−0.3 to +9

V

100

mA

Drive Output (Pin 7)

Maximum Voltage Range

Maximum Current Range (Note 2)

Vmax

Imax

−0.3 to +18

V

−500 to +750

mA

Power Supply Voltage (Pin 8)

Maximum Voltage Range

Maximum Current

Vmax

Imax

−0.3 to +18

V

100

mA

Power Dissipation and Thermal Characteristics

P suffix, Plastic Package, Case 626

Maximum Power Dissipation @ TA=70 °C

Thermal Resistance, Junction−to−Air

D suffix, Plastic Package, Case 751

Maximum Power Dissipation @ TA=70 °C

Thermal Resistance, Junction−to−Air

PD

RqJA

PD

RqJA

800

mW

100

°C/W

450

mW

178

°C/W

Operating Junction Temperature Range

TJ

−40 to +125

°C

Storage Temperature Range

Tstg

−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.

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