TECHNICAL DATA

Rev. 00

Constant Voltage and Constant Current Controller

for Adaptors and Battery Chargers

Description

IK3051A is a highly integrated solution for SMPS

applications requiring constant voltage and constant

current mode.

IK3051A

integrates

one

voltage

reference,

two

operational amplifiers (with ORed outputs – common

collectors), and a current sensing circuit.

The voltage reference combined with one operational

amplifier makes it an ideal voltage controller, and the

other low voltage reference combined with the other

operational amplifier makes it an ideal current limiter for

output low side current sensing.

The current threshold is fixed and precise.

The only external components are:

•

A resistor bridge to be connected to the output of

the power supply (adapter, battery charger) to set

the voltage regulation by dividing the desired output

voltage to match the internal voltage reference

value.

•

A sense resistor having a value and allowable

dissipation

power

which

need

to

be

chosen

according to the internal voltage threshold.

•

Optional compensation components (R and C).

IK3051A, is ideal for smallest package available, is

ideal for space shrinked applications such as adapters

and battery chargers.

Features

• CONSTANT VOLTAGE AND CONSTANT CURRENT

CONTROL

• LOW VOLTAGE OPERATION

• PRECISION INTERNAL COMPONENT COUNT

• CURRENT SINK OUTPUT STAGE

• EASY COMPENSATION

• LOW AC MAINS VOLTAGE REJECTION

Pin Definitions and Functions

SOT23-6 Pinout

Name

Pin#

Type

Function

Vcc

6

Power Supply

Positive Power Supply Line

GND

2

Power Supply

Ground Line. 0V Reference For All Voltages

Vctrl

1

Analog Input

Input Pin of the Voltage Control Loop

Ictrl

4

Analog Input

Input Pin of the Current Control Loop

Out

3

Current Sink Output

Output Pin. Sinking Current Only

Vsense

5

Analog Input

Input Pin of the Current Control Loop

IK3051A