NCP1239

www.onsemi.com

2

Figure 1. Application Schematic (OPP Adjustment)

NCP1239

Vbulk

.

.

OPP

adjsut.

Vout

OVP

1

2

6

45

8

3

NTC

Table 1. PIN FUNCTION DESCRIPTION

Pin No.

Pin Name

Description

1

Fault

The controller enters fault mode if the voltage of this pin is pulled above or below the fault thresholds.

A precise pull up current source allows direct interface with an NTC thermistor. Fault detection

triggers a latch.

2

FB

Hooking an optocoupler collector to this pin will allow regulation.

3

CS

This pin monitors the primary peak current but also offers an overpower compensation adjustment.

When the CS pin is brought above 1.2 V, the part is permanently latched off.

4

GND

The controller ground.

5

DRV

The driver’s output to an external MOSFET gate.

6

VCC

This pin is connected to an external auxiliary voltage. An OVP comparator monitors this pin and

offers a means to latch the converter in fault conditions.

7

NC

Non-connected for improved creepage distance.

8

HV

Connected to the bulk capacitor or rectified ac line, this pin powers the internal current source to

deliver a start-up current. It is also used to provide the brown-out detection and the HV sensing for

the Overpower protection.

Table 2. DEVICE OPTION AND DESIGNATIONS

Device

Frequency

OCP Protection

Fault Pin

Protection

BO Levels

NCP1239AD65R2G

65 kHz

Latch

Latch

Latch

110/101

NCP1239BD65R2G

65 kHz

Auto-Recovery

Latch

Latch

110/101

NCP1239CD65R2G

65 kHz

Auto-Recovery

Auto-Recovery

Latch

110/101

NCP1239DD65R2G

65 kHz

Auto-Recovery

Latch

Latch

101/95

NCP1239ED65R2G

65 kHz

Auto-Recovery

Auto-Recovery

Auto-Recovery

110/101

NCP1239AD100R2G

100 kHz

Latch

Latch

Latch

110/101

NCP1239BD100R2G

100 kHz

Auto-Recovery

Latch

Latch

110/101