Si9137

Vishay Siliconix

Document Number: 70874

S-20642—Rev. B, 13-May-02

www.vishay.com

3

SPECIFICATIONS

Limits

Test Conditions

Parameter

Unit

Reference

REF Output

No External Load

3.24

3.30

3.36

V

REF Load Regulation

0 to 1 mA

30

75

mV

Supply Current

Supply Current

*Shutdown

RUN/STOP = GND, All Converters OFF, No Load

25

60

m

Supply Current

*Operation

1100

1800

mA

Oscillator

Oscillator Frequency

270

300

330

kHz

Maximum Duty Cycle

92

95

%

Fault Detection 3.3-V and 5-V Outputs

Overvoltage Trip Threshold

With Respect To Unloaded Output Voltage

6

10

14

%

Overvoltage-Fault Propagation Delay

CS3 or CS5 Driven 2% Above Overvoltage Trip Thresh-

old

1.5

ms

Output Undervoltage Threshold

With Respect to Unloaded Output Voltage

–40

–30

–20

%

Output Undervoltage Lockout Time

From each SMPS Enabled

16

20

24

ms

RESET

RESET Start Threshold

With Respect To Unloaded Output Voltage

Rising Edge

–5.5

%

RESET Propagation Delay (Falling)

Falling Edge, FB3 or FB5 Driven 2% Above Overvoltage

or 2% Below Undervoltage Lockout Thresholds

1.5

ms

RESET Delay Time (Rising)

With Respect to 2nd SMPS Lockout Time Done

92

107

122

ms

Inputs and Outputs

Feedback Input Leakage Current

FBFY = 3.3 V

1

m

Input Leakage Current

"1

mA

Gate Driver Sink/Source Current (Buck)

DL3, DH3, DL5, DH5 Forced to 2 V

1

A

Gate Driver On-Resistance (Buck)

High or Low

2

7

W

Gate Driver Sink/Source Current (Flyback)

DHFY, DLFY Forced to 2 V

0.2

A

Gate Driver On-Resistance (Flyback)

High or Low

15

W

RESET Output Low Voltage

0.4

V

RESET High Voltage Leakage

RESET = 5 V

1

mA

RUN/STOP

0.8

2.4

V

Notes

a.

The algebraic convention is used whereby the most negative value is a minimum and the most positive a maximum.

b.