3940_03 datasheet(6/12 Pages) ALLEGRO

6 / 12 page

3940

FULL-BRIDGE POWER

MOSFET CONTROLLER

115 Northeast Cutoff, Box 15036

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

ELECTRICAL CHARACTERISTICS: unless otherwise noted at T

A = -40°C to +135°C, TJ = -40°C to +150°C,

IN ≤

≤≤≤≤ V

BB = 7 V to 40 V, Cp = 0.47 µF, Cr = 1 µF, CREG5 = 0.1 µF, CREG13 = 10 µF, CBOOT = 0.1 µF, PWM = 22.5 kHz

square wave.

Limits

Characteristics

Symbol

Conditions

Min

Typ

Max

Units

Bootstrap Circuit

Diode Forward Current Limit

ICX

3 V < [(VREG13 = 13.5 V) - VCX] < 12 V

140

–

1000

Diode Forward Drop

IF = 10 mA

0.8

–

2.0

Diode Resistance

RF(100) = [VF(150) - VF(50)]/100

1.5

–

6.5

Ω

Top-off CP Source Current at Cx

Icx

VCX - VSX = 8 V, VBB = 40 V, GHx = 1(no load)

–

µA

Fault Logic

VBB Undervoltage

BB(uv)

Decreasing V

4.5

5.25

6.0

VBB Undervoltage Hysteresis

∆V

BB(uv)

BB(recovery) - VBB(uv)

200

450

700

VREG13 Undervoltage

REG13(uv)

Decreasing V

7.5

8.25

9.0

VREG13 Undervoltage Hyst.

∆V

REG13(uv)

REG13(recovery) - VREG13(uv)

200

450

700

VBB Overvoltage

BB(ov)

Increasing V

BB, FAULT = 0 to 1, VOVSET = 0 V

19.6

Increasing V

BB, FAULT = 0 to 1, VOVSET = 0.45 V

30.5

Increasing V

BB, FAULT = 0 to 1, VOVSET = 0.9 V

32.5

36.4

VBB Overvoltage Hysteresis

∆V

BB(ov)

BB(ov) - VBB(recovery)

2.1

3.1

4.1

OVSET Input Current

SET(ov)

0 V < V

SET(ov) < 0.9 V

–

1.4

µA

VDSTH Input Current

DSTH

0.3 V < V

DSTH < 3 V

–

1.0

µA

Short-to-Ground Threshold

STG(th)

DSTH = 0.3 V

DSTH-0.14

–

DSTH+0.10

DSTH = 1.0 V

DSTH-0.18

–

DSTH+0.13

DSTH = 3.0 V

DSTH-0.39

–

DSTH+0.26

Short-to-Battery Threshold

STB(th)

DSTH = 0.3 V

DSTH-0.20

–

DSTH+0.30

DSTH = 1.0 V

DSTH-0.24

–

DSTH+0.30

DSTH = 3.0 V

DSTH-0.37

–

DSTH+0.30

DRAIN /Open Bridge Threshold

DO(th)

If V

DRAIN < VDO(th), FAULT = 0 to 1

1.0

–

3.0

DRAIN /Open Bridge Current

VDRAIN

RESET = 0

–

1.0

µA

RESET = 1, V

DSTH < 3 V

–

500

µA

Fault Latch Clear Pulsewidth

latch

RESET = 0, pulse

0.15

–

2.0

µs

Fault Clear Propagation Delay

From RESET = 1 to FAULT = 0

–

2.0

–

µs

Fault Detection Noise Filter

noise

–

1.7

–

µs

Fault Output

out(0)

out = 5 mA, faults negated

–

0.4

out(1)

out = 5 V, open-drain, fault asserted

–

1.0

µA

Thermal Shutdown Temperature

J increasing

–

172

–

°C

Thermal Shutdown Hysteresis

∆T

J decreasing

–

°C

NOTES: Typical Data is for design information only.

Negative current is defined as coming out of (sourcing) the specified device terminal.

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