SI786 datasheet(3/14 Pages) VISHAY

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Si786

Vishay Siliconix

Document Number: 70189

S-40807—Rev. J, 26-Apr-04

www.vishay.com

SPECIFICATIONS

Limitse

Specific Test Conditions

V+ = 15 V, IVL = IREF = 0 mA, SHDN = ON3 = ON5 = 5 V

Other Digital Input Levels 0 V or 5 V, TA = TMIN to TMAX

Parameter

Unit

Maxa

Typb

Mina

Specific Test Conditions

V+ = 15 V, IVL = IREF = 0 mA, SHDN = ON3 = ON5 = 5 V

Other Digital Input Levels 0 V or 5 V, TA = TMIN to TMAX

Comparators

D1 D2 Trip Voltage

Falling Edge Hysteresis = 1%

1.61

1.69

D1, D2 Trip Voltage

Falling Edge, Hysteresis = 1%

Si786DG/DRG/DSG

1.60

1.69

D1, D2 Input Current

D1 = D2 = 0 V, 5 V

"100

Q1, Q2 Source Current

VH = 15 V VOUT = 2 5 V

Q1, Q2 Sink Current

VH = 15 V, VOUT = 2.5 V

200

500

1000

Q1, Q2 Output High Voltage

ISOURCE = 5 mA, VH = 3 V

VH - 0.5

Q1, Q2 Output Low Voltage

ISINK = 20 mA, VH = 3 V

0.4

Quiescent VH Current

VH = 18 V, D1 = D2 = 5 V, No External Load

Oscillator and Inputs/Outputs

SYNC = 3 3 V

270

300

330

Oscillator Frequency

SYNC = 3.3 V

Si786DG/DRG/DSG

260

300

330

kHz

Oscillator Frequency

SYNC = 0 V 5 V

170

200

230

kHz

SYNC = 0 V, 5 V

Si786DG/DRG/DSG

165

200

230

SYNC High Pulse Width

200

SYNC Low Pulse Width

200

SYNC Rise/Fall Time

Not Tested

200

Oscillator SYNC Range

240

350

kHz

Maximum Duty Cycle

SYNC = 3.3 V

Maximum Duty Cycle

SYNC = 0 V, 5 V

Input Low Voltage

SHDN, ON3, ON5 SYNC

0.8

Input High Voltage

SHDN, ON3, ON5

2.4

Input High Voltage

SYNC

VL - 0.5

Input Current

SHDN, ON3, ON5 VIN = 0 V, 5 V

DL3/DL5 Sink/Source Current

VOUT = 2 V

DH3/DH5 Sink/Source Current

BST3 - LX3 = BST5 - LX5 = 4.5 V, VOUT = 2 V

DL3/DL5 On-Resistance

High or Low

DH3/DH5 On-Resistance

High or Low

BST3 - LX3 = BST5 - LX5 = 4.5 V

Notes

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

Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.

The main switching outputs track the reference voltage. Loading the reference reduces the main outputs slightly according to the closed-loop gain (AVCL) and

the reference voltage load-regulation error. AVCL for the 3.3-V supply is unity gain. AVCL for the 5-V supply is 1.54.

Since the reference uses VL as its supply, its V+ line regulation error is insignificant.

Limits are for all temperature grades unless otherwise noted.

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