CS5156 datasheet(5/17 Pages) ONSEMI

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CS5156

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ELECTRICAL CHARACTERISTICS (continued) (0°C < TA < +70°C; 0°C < TJ < +85°C; 8.0 V < VCC1 < 14 V; 5.0 V < VCC2 < 14 V;

DAC Code: VID4 = VID2 = VID1 = VID0 = 1; VID3 = 0; CVGATE = 1.0 nF; COFF = 330 pF; CSS = 0.1 μF, unless otherwise specified.)

Characteristic

Unit

Max

Typ

Min

Test Conditions

Supply Current

ICC1

No Switching

−

8.5

13.5

ICC2

No Switching

−

1.6

3.0

Operating ICC1

VFB = COMP = VFFB

−

8.0

Operating ICC2

VFB = COMP = VFFB

−

2.0

5.0

COFF

Normal Charge Time

VFFB = 1.5 V; VSS = 5.0 V

1.0

1.6

2.2

μs

Extension Charge Time

VSS = VFFB = 0

5.0

8.0

11.0

μs

Discharge Current

COFF to 5.0 V; VFB > 1.0 V

5.0

−

Time Out Timer

Time Out Time

VFB = VCOMP; VFFB = 2.0 V;

Record VGATE Pulse High Duration

μs

Fault Mode Duty Cycle

VFFB = 0V

PACKAGE PIN DESCRIPTION

PACKAGE PIN #

PIN SYMBOL

FUNCTION

SO−16, DIP−16

1, 2, 3, 4, 6

VID0−VID4

Voltage ID DAC input pins. These pins are internally pulled up to 5.0 V providing

logic ones if left open. VID4 selects the DAC range. When VID4 is High (logic

one), the DAC range is 2.14 V to 3.54 V with 100 mV increments. When VID4 is

Low (logic zero), the DAC range is 1.34 V to 2.09 V with 50 mV increments. VID0

− VID4 select the desired DAC output voltage. Leaving all 5 DAC input pins open

results in a DAC output voltage of 1.244 V, allowing for adjustable output volt-

age, using a traditional resistor divider.

Soft Start Pin. A capacitor from this pin to LGND in conjunction with internal 60 μA

current source provides Soft Start function for the controller. This pin disables fault

detect function during Soft Start. When a fault is detected, the Soft Start capacitor

is slowly discharged by internal 2.0 μA 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.

COFF

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.

VFFB

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

regulator output. The inner feedback loop terminates on time.

VCC2

Boosted power for the gate driver.

VGATE

MOSFET driver pin capable of 1.5 A peak switching current.

PGND

High current ground for the IC. The MOSFET driver is referenced to this pin. Input

capacitor ground and the anode of the Schottky diode should be tied to this pin.

No connection.

VCC1

Input power for the IC.

LGND

Signal ground for the IC. All control circuits are referenced to this pin.

COMP

Error amplifier compensation pin. A capacitor to ground should be provided exter-

nally to compensate the amplifier.

VFB

Error amplifier DC feedback input. This is the master voltage feedback which sets

the output voltage. This pin can be connected directly to the output or a remote

sense trace.

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