3946_04 datasheet(3/13 Pages) ALLEGRO

3 / 13 page

Worcester, Massachusetts 01615-0036 (508) 853-5000

115 Northeast Cutoff, Box 15036

www.allegromicro.com

3946

Half-Bridge Power MOSFET Controller

ELECTRICAL CHARACTERISTICS

at T

A = –40 to +135°C, VBB = 7 to 60 V (unless otherwise noted)

Characteristics

Symbol

Test Conditions

Limits

Min.

Typ.

Max.

Units

BB Quiescent Current

VBB

RESET = High, Outputs Low

–

RESET = Low

––

μA

VREG Output Voltage

REG

BB > 7.75 V, Ireg = 0 mA to 15 mA

12.0

13.5

BB = 7 V to 7.75 V, Ireg = 0 mA to 15 mA

11.0

–

13.5

Charge Pump Frequency

CP1, CP2

–

62.5

–

kHz

VREF Output Voltage

REF

REF ≤ 4 mA, CREF = 0.1 μF

4.5

–

5.5

Gate Output Drive

Turn On Time

rise

LOAD = 3300 pF, 20% to 80%

–

100

Turn Off Time

fall

LOAD = 3300 pF, 80% to 20%

–

Pullup On Resistance

DSUP

j = 25°C

–

j = 135°C

–

Pulldown On Resistance

DSDOWN

j = 25°C

–

j = 135°C

–

Short Circuit Current –

Source

–

pw < 10 μs

800

––

Short Circuit Current –

Sink

–

pw < 10 μs

1000

––

GH Output Voltage

pw < 10 μs, Bootstrap Capacitor fully charged

REG – 1.5

––

GL Output Voltage

–

REG – 0.2

––

Timing

Dead Time (Delay from

Turn Off to Turn On)

DEAD

dead = 5 kΩ

200

350

500

dead = 100 kΩ

567

μs

Propagation Delay

Logic input to unloaded GH, GL. DT = VREF

––

150

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