NCP1653_09 datasheet(3/19 Pages) ONSEMI

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NCP1653, NCP1653A

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PIN FUNCTION DESCRIPTION

Symbol

Name

Function

FB / SD

Feedback /

Shutdown

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

The current is for 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−consumption shutdown mode.

Vcontrol

Control Voltage /

Soft−Start

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 Ccontrol to limit the Vcontrol bandwidth

typically below 20 Hz to achieve near unity power factor.

The device provides no output when Vcontrol = 0 V. Hence, Ccontrol also works as a soft−start

capacitor.

Input Voltage

Sense

This pin sinks an input−voltage current Ivac which is proportional to the RMS input voltage Vac.

The current Ivac is for overpower limitation (OPL) and PFC duty cycle modulation. When the

product (IS⋅Ivac) goes above 3 nA2, OPL is activated and the Drive Output duty ratio is reduced by

pulling down Vcontrol indirectly to reduce the input power.

Input Current

Sense

This pin sources a current IS which is proportional to the inductor current IL. The sense current IS

is for overcurrent protection (OCP), overpower limitation (OPL) and PFC duty cycle modulation.

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

Multiplier

Voltage

This pin provides a voltage VM for the PFC duty cycle modulation. The input impedance of the

PFC circuit is proportional to the resistor RM externally connected to this pin. The device operates

in average current−mode if an external capacitor CM is connected to the pin. Otherwise, it

operates in peak current−mode.

GND

The IC Ground

−

Drv

Drive Output

This pin provides an output to an external MOSFET.

VCC

Supply Voltage

This pin is the positive supply of the device. The operating range is between 8.75 V and 18 V with

UVLO start threshold 13.25 V.

MAXIMUM RATINGS

Rating

Symbol

Value

Unit

FB, Vcontrol, In, CS, VM Pins (Pins 1−5)

Maximum Voltage Range

Maximum Current

Vmax

Imax

−0.3 to +9

100

Drive Output (Pin 7)

Maximum Voltage Range

Maximum Current Range (Note 1)

Vmax

Imax

−0.3 to +18

1.5

Power Supply Voltage (Pin 8)

Maximum Voltage Range

Maximum Current

Vmax

Imax

−0.3 to +18

100

Transient Power Supply Voltage, Duration < 10 ms, IVCC < 20 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

RqJA

800

100

450

178

°C/W

Operating Junction Temperature Range

−40 to +125

°C

Storage Temperature Range

Tstg

−65 to +150

°C

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.

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 190 V.

This device contains Latchup protection and exceeds ±100 mA per JEDEC Standard JESD78.

1. Guaranteed by design.

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