CS5157GD16 datasheet(4/14 Pages) CHERRY

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PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Package Pin Description

PACKAGE PIN #

PIN SYMBOL

FUNCTION

Electrical Characteristics: 0°C < TA < +70°C; 0°C < TJ < +85°C; 8V < VCC1 < 14V; 5V < VCC2 < 14V; DAC Code: VID4 = VID2 = VID1

= VID0 = 1; VID3 = 0; CVGATE(L) and CVGATE(H) = 1nF; COFF = 330pF; CSS = 0.1µF, unless otherwise specified.

16L SO Narrow

1,2,3,4,6

VID0 – VID4

Voltage ID DAC input pins. These pins are internally pulled up to 5V

providing logic ones if left open. VID4 selects the DAC range. When VID4

is High (logic one), the DAC range is 2.10V to 3.50V with 100mV incre-

ments. When VID4 is Low (logic zero), the DAC range is 1.30V to 2.05V

with 50mV increments. VID0 - VID4 select the desired DAC output volt-

age. Leaving all 5 DAC input pins open results in a DAC output voltage

of 1.2440V, allowing for adjustable output voltage, using a traditional

resistor divider.

Soft Start Pin. A capacitor from this pin to LGnd in conjunction with

internal 60µA current source provides soft start function for the con-

troller. This pin disables fault detect function during Soft Start. When a

fault is detected, the soft start capacitor is slowly discharged by internal

2µA current source setting the time out before trying to restart the IC.

Charge/discharge current ratio of 30 sets the duty cycle for the IC when

the regulator output is shorted.

7COFF

A capacitor from this pin to ground sets the time duration for the on

board one shot, which is used for the constant off time architecture.

8VFFB

Fast feedback connection to the PWM comparator. This pin is connected

to the regulator output. The inner feedback loop terminates on time.

9VCC2

Boosted power for the high side gate driver.

VGATE(H)

High FET driver pin capable of 1.5A peak switching current. Internal cir-

cuit prevents VGATE(H) and VGATE(L) from being in high state simultane-

ously.

PWM Comparator

Transient Response

VFFB = 0 to 5V to VGATE(H) = 9V to 1V;

100

125

VCC1 = VCC2 = 12V

VFFB Bias Current

VFFB = 0V

0.3

µA

Supply Current

ICC1 No Switching

8.5

13.5

ICC2 No Switching

1.6

3.0

Operating ICC1

VFB = COMP = VFFB

813

Operating ICC2

VFB = COMP = VFFB

COFF

Normal Charge Time

VFFB = 1.5V; VSS = 5V

1.0

1.6

2.2

µs

Extension Charge Time

VSS = VFFB = 0

5.0

8.0

11.0

µs

Discharge Current

COFF to 5V; VFB >1V

5.0

Time Out Timer

Time Out Time

VFB = VCOMP; VFFB = 2V;

µs

Record VGATE(H) Pulse High Duration

Fault Mode Duty Cycle

VFFB = 0V

Note 1: Guaranteed by design, not 100% tested in production.

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