CS5257A-1 参数 Datasheet PDF下载

CS5257A-1

Electrical Characteristics:

0¡C ² T

A

² 70¡C, 0¡C ² T

J

² 150¡C, V

SENSE

= V

OUT

and V

Adj

= 0V unless otherwise specified.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

V

POWER

Supply Only

Output Current

Note 1:

Note 2:

Note 3:

Note 4:

Note 5:

V

POWER

= 6V, V

CONTROL

not connected,

V

ADJUST

= V

OUT

= V

SENSE

= 0V

0.1

1

mA

The minimum load current is the minimum current required to maintain regulation. Normally the current in the resistor divider used to set

the output voltage is selected to meet the minimum load current requirement.

The V

CONTROL

pin current is the drive current required for the output transistor. This current will track output current with roughly a 1:100

ratio. The minimum value is equal to the quiescent current of the device.

This parameter is guaranteed by design and is not 100% production tested.

Dropout is defined as either the minimum control voltage, (V

CONTROL)

or minimum power voltage (V

POWER

) to output voltage differential

required to maintain 1.5% regulation at a particular load current.

This parameter is guaranteed by design, but not parametrically tested in production. However, a 100% thermal shutdown functional test is

performed on each part.

Package Pin Description

PACKAGE PIN #

PIN SYMBOL

FUNCTION

5L TO-220

1

V

SENSE

This Kelvin sense pin allows for remote sensing of the output voltage at the

load for improved regulation. It is internally connected to the positive input

of the voltage sensing error amplifier.

This pin is connected to the low side of the internally trimmed 1.5% bandgap

reference voltage and carries a bias current of about 50µA. A resistor divider

from Adj to V

OUT

and from Adj to ground sets the output voltage. Also,

transient response can be improved by adding a small bypass capacitor from

this pin to ground.

This pin is connected to the emitter of the power pass transistor and pro-

vides a regulated voltage capable of sourcing 7A of current.

This is the supply voltage for the regulator control circuitry. For the device

to regulate, this voltage should be between 1V and 1.25V (depending on the

output current) greater than the output voltage. The control pin current will

be about 1% of the output current.

This is the power input voltage. The pin is physically connected to the collec-

tor of the power pass transistor. For the device to regulate, this voltage

should be between 0.1V and 0.65V greater than the output voltage, depend-

ing on output current. The output load current of 7A is supplied through

this pin.

Block Diagram

2

Adjust

3

4

V

OUT

V

CONTROL

5

V

POWER

V

POWER

V

CONTROL

BIAS

and

TSD

V

REF

-

+

EA

IA

+

-

V

OUT

V

SENSE

Adjust

3