NCP1616 データシートの表示（PDF） - ON Semiconductor

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NCP1616

High Voltage High Efficiency Power Factor Correction Controller

ON Semiconductor 

NCP1616

Table 1. PIN FUNCTION DESCRIPTION

Pin Number

Name

Function

1

FB

This pin receives a portion of the PFC output voltage for the regulation and the dynamic response en-

hancer (DRE) that speeds up the loop response when the output voltage drops below 95.5% of the

regulation level. VFB is also the input signal for the Soft−Overvoltage Comparators as well as the Un-

dervoltage (UVP) Comparator. The UVP Comparator prevents operation as long as VFB is lower than

12% of the reference voltage (VREF). The Soft−Overvoltage Comparator (Soft−OVP) gradually reduces

the duty ratio to zero when VFB exceeds 105% of VREF. A 250 nA sink current is built−in to trigger the

UVP protection and disable the part if the feedback pin is accidentally open. A dedicated comparator

monitors the bulk voltage and disables the controller if a line overvoltage fault is detected. The Fast

Overvoltage (Fast−OVP) and Bulk Undervoltage (BUV) comparators monitor the FB pin voltage. The

circuit disables the driver if the VFB exceeds the VFOVP threshold which is set 2% higher than the

reference for the Soft−OVP comparator.

The BUV Comparator trips when VFB falls below VBUV. A BUV fault disables the driver and grounds

the PFCOK latch. The BUV function has no action whenever the PFCOK latch is in low state. Once the

downstream converter is enabled the BUV Comparator monitors the output voltage to ensure it is high

enough for proper operation of the downstream converter.

2

STDBY/ This pin is used to force the controller into standby mode. The controller enters fault mode if the voltage

FAULT

of this pin is pulled above the fault threshold. Fault detection triggers a latch.

3

Control

The error amplifier output is available on this pin. The network connected between this pin and ground

sets the regulation loop bandwidth. It is typically set below 20 Hz to achieve high power factor ratios.

This pin is grounded when the controller is disabled. The voltage on this pin gradually increases during

power up to achieve a soft−start.

4

FFcontrol This pin sources a current representative to the line current. Connect a resistor between this pin and

GND to generate a voltage representative of the line current. When this voltage exceeds the internal

2.5 V reference, the circuit operates in critical conduction mode. If the pin voltage is below 2.5 V, a

dead−time is generated. By this means, the circuit increases the deadtime when the current is smaller

and decreases the deadtime as the current increases.

The circuit skips cycles whenever VFFcontrol is below 0.65 V to prevent the PFC stage from operating

near the line zero crossing where the power transfer is particularly inefficient. This does result in a

slightly increased distortion of the current. If superior power factor is required, offset the voltage on this

pin by more than 0.75 V to inhibit skip operation.

5

CS/ZCD This pin monitors the MOSFET current to limit its maximum current. This pin is also connected to an

internal comparator for zero current detection (ZCD). This comparator is designed to monitor a signal

from an auxiliary winding and to detect the core reset when this voltage drops to zero. The auxiliary

winding voltage is to be applied through a diode to avoid altering the current sense information for the

on time (see application schematic).

6

GND

Ground reference.

7

DRV

MOSFET driver. The high current capability of the totem pole gate drive (−0.5/ +0.8 A) makes it suitable

to effectively drive high gate charge power MOSFETs.

8

VCC

Supply input. This pin is the positive supply of the IC. The circuit starts to operate when VCC exceeds

VCC(on). After start−up, the operating range is 9.5 V up to 28 V.

9

HV

This pin is the input for the line removal detection, line level detection, and brownout detection circuits.

This pin is also the input for the high voltage start−up circuit.

Table 2. ORDERABLE PART OPTION

Part Number

Restart

Threshold

NCP1616A1DR2G

2.35 V

NCP1616A2DR2G

2.35 V

Idt1

125.5 mA

125.5 mA

Brownout

100 Vdc

100 Vdc

Max Dead−Time

29 ms

29 ms

High Line

Threshold

236 Vdc

236 Vdc

Line OVP

Enabled

Disabled

Table 3. ORDERING INFORMATION

Part Number

Device Marking

Package

Shipping†

NCP1616A1DR2G

1616A1

SOIC−10 NB, LESS PIN 9

(Pb−Free)

2500 / Tape & Reel

NCP1616A2DR2G

1616A2

SOIC−10 NB, LESS PIN 9

(Pb−Free)

2500 / Tape & Reel

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

www.onsemi.com

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