NCP3064, NCP3064B, NCV3064

http://onsemi.com

2

Figure 2. Pin Connections

Timing Capacitor

Comparator

Inverting

Input

ON/OFF

GND

Switch Emitter

Switch Collector

(Top View)

4

3

2

1

5

6

7

8

Comparator

Inverting

Input

ON/OFF

Timing Capacitor

GND

Switch Emitter

Switch Collector

(Top View)

Figure 3. Pin Connections

NOTE: EP Flag must be tied to GND Pin 4 on PCB

EP Flag

SOIC−8/PDIP−8

DFN8

Figure 4. Block Diagram

5

R

S

Q

+

−

7

Comparator

CT

3

8

TSD

0.2 V

+

−

2

6

R

S

Q

4

1

Switch Collector

Switch Emitter

Timing Capacitor

GND

Comparator Inverting Input

ON/OFF

Oscillator

1.25 V

Reference

Regulator

ON/OFF

Bias

Comparator

PIN DESCRIPTION

Pin No.

Pin Name

Description

1

Switch Collector

Internal Darlington switch collector

2

Switch Emitter

Internal Darlington switch emitter

3

Timing Capacitor

Timing Capacitor Oscillator Input, Timing Capacitor

4

GND

Ground pin for all internal circuits

5

Comparator

Inverting Input

Inverting input pin of internal comparator

6

Voltage supply

7

Peak Current Sense Input to monitor the voltage drop across an external resistor to limit the peak

current through the circuit

8

ON/OFF

ON/OFF Pin. Pulling this pin to High level turns the device in Operating. To switch into mode with

low current consumption this pin has to be in Low level or floating.