SI9122DQ-T1-E3 datasheet(5/20 Pages) VISHAY

Part #	SI9122DQ-T1-E3

Description	500-kHz Half-Bridge DC/DC Controller with Integrated Secondary Synchronous Rectification Drivers

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Manufacturer	VISHAY [Vishay Siliconix]

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5 / 20 page

Document Number: 71815

S-80038-Rev. J, 14-Jan-08

www.vishay.com

5

Vishay Siliconix

Si9122

SPECIFICATIONSa

Parameter

Symbol

Test Conditions

Unless Otherwise Specified

fNOM = 500 kHz, VIN = 72 V

VINDET = 7.2 V; 10 V ≤ VCC ≤ 13.2 V

Limits

- 40 to 85 °C

Unit

Min.b

Typ.c

Max.b

Pre-Regulator

VCC Pre-Regulator Turn Off

Threshold Voltage

VREG1

VINDET > VREF

7.4

9.1

10.4

V

TA = 25 °C

8.5

9.1

9.7

VREG2

VINDET = 0 V

9.2

Undervoltage Lockout

VUVLO

VCC Rising

7.15

8.8

9.8

TA = 25 °C

8.1

8.8

9.3

VUVLO Hysteresis

g

VUVLOHYS

0.5

Soft-Start

Soft-Start Current Output

ISS

Start-Up Condition

12

20

28

µA

Soft-Start Completion Voltage

VSS_COMP

Normal Operation

7.35

8.05

8.85

V

Shutdown

VINDET Shutdown FN

VSD

VINDET Rising

350

550

720

mV

VINDET Hysteresis

VINDET

200

VINDET Input Threshold Voltages

VINDET - VIN Under Voltage

VUV

VINDET Rising

3.13

3.3

3.46

V

VUV Hysteresis

VINDET

0.23

0.3

0.35

Over Temperature Protection

Activating Temperature

TJ Increasing

160

°C

De-Activating Temperature

TJ Decreasing

130

Converter Supply Current (VCC)

Shutdown

ICC1

Shutdown, VINDET = 0 V

50

350

µA

Switching Disabled

ICC2

VINDET < VREF

48

12

mA

Switching w/o Load

ICC3

VINDET > VREF, fNOM = 500 kHz

510

15

Switching with CLOAD

ICC4

VCC = 12 V, CDH = CDL = 3 nF

CSRH = CSRL = 0.3 nF

21

Output MOSFET DH Driver (High-Side)

Output High Voltage

VOH

Sourcing 10 mA

VBST - 0.3

V

Output Low Voltage

VOL

Sinking 10 mA

VLX + 0.3

Boost Current

IBST

VLX = 72 V, VBST = VLX + VCC

1.3

1.9

2.7

mA

LX Current

ILX

VLX = 72 V, VBST = VLX + VCC

- 1.3

- 0.7

- 0.4

Peak Output Source

ISOURCE

VCC = 10 V

- 1.0

- 0.75

A

Peak Output Sink

ISINK

0.75

1.0

Rise Time

tr

CDL = 3 nF

35

ns

Fall Time

tf

35

Output MOSFET DL Driver (Low-Side)

Output High Voltage

VOH

Sourcing 10 mA

VCC - 0.3

V

Output Low Voltage

VOL

Sinking 10 mA

0.3

Peak Output Source

ISOURCE

VCC = 10 V

- 1.0

- 0.75

A

Peak Output Sink

ISINK

0.75

1.0

Rise Time

tr

CDH = 3 nF

35

ns

Fall Time

tf

35

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