CS5111 datasheet(4/16 Pages) ONSEMI

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CS5111

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ELECTRICAL CHARACTERISTICS (continued) (5.0 V

≤ VIN ≤ 26 V and –40°C ≤ TJ ≤ 150°C, COUT = 100 µF (ESR ≤ 8.0 Ω),

CDelay = 0.1 µF, RBIAS = 64.9 kΩ, COSC = 390 pF, CCOMP = 0.1 µF; unless otherwise specified.)

Characteristic

Unit

Max

Typ

Min

Test Conditions

Switcher Section (continued)

VFB1 Regulation Voltage

–

1.206

1.25

1.294

VFB2 Regulation Voltage

–

1.206

1.25

1.294

VFB1, VFB2 Input Current

VFB1 = VFB2 = 5.0 V

–

1.0

µA

Oscillator Charge Current

COSC = 0 V

µA

Oscillator Discharge Current

COSC = V40

270

320

370

µA

CDelay Charge Current

CDelay = 0 V

µA

Switcher Max Duty Cycle

VSW = 5.0 V with 50 Ω Load,

VFB1 = VFB2 = 1.0 V

Current Sense Amp Gain

ISW = 2.3 A

–

7.0

–

V/V

Error Amp DC Gain

–

Error Amp Transconductance

–

2700

–

µA/V

ENABLE Input

VIL

–

0.8

1.24

–

VIH

–

1.3

2.0

Hysteresis

–

Input Impedance

–

Ω

Select Input

VIL (Selects VFB1)

4.9

≤ VLIN ≤ 5.1

0.8

1.25

–

VIH (Selects VFB2)

4.9

≤ VLIN ≤ 5.1

–

1.25

2.0

SELECT Pull–Up

SELECT = 0 V

Ω

Floating Input Voltage

–

3.5

4.5

–

PIN FUNCTION DESCRIPTION

PACKAGE PIN #

SO–24L

PIN SYMBOL

FUNCTION

VIN

Supply voltage.

2, 3

No connection.

VSW

Collector of NPN power switch for switching regulator section.

5, 6, 7, 8, 17, 18, 19, 20

GND

Connected to the heat removing leads.

VFB1

Feedback input voltage 1 (referenced to 1.25 V).

VFB2

Feedback input voltage 2 (referenced to 1.25 V).

SELECT

Logic level input that selects either VFB1 or VFB2. An open selects VFB2. Connect

to GND to select VFB1.

COMP

Output of the transconductance error amplifier.

COSC

A capacitor connected to GND sets the switching frequency. Refer to Figure 5.

WDI

Watchdog input. Active on falling edge.

CDelay

A capacitor connected to GND sets the Power On Reset and Watchdog time.

RESET

RESET output. Active low if VLIN is below the regulation limit. If watchdog timeout

is reached, a reset pulse train is issued.

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