BTM7745G datasheet(13/24 Pages) INFINEON

13 / 24 page

Data Sheet

Rev. 1.0, 2010-05-28

High Current H-Bridge

BTM7745G

Block Description and Characteristics

6.2.3

Pos.

Parameter

Symbol

Limit Values

Unit

Test Conditions

Min.

Typ.

Max.

High Side Switch Dynamic Characteristics

Rise-time of HS

tr(HS)

µs

–

Slew rate HS on

ΔV

OUT/

tr( HS)

–

0.4

–

V/µs

–

Switch on delay time HS

tdr(HS)

140

µs

–

Fall-time of HS

tf(HS)

µs

–

Slew rate HS off

ΔV

OUT/

tf(HS)

–

0.4

–

V/µs

–

Switch off delay time HS

tdf(HS)

µs

–

Low Side Switch Dynamic Characteristics

Rise-time of LS

tr(LS)

µs

–

Slew rate LS switch off

ΔV

OUT/

tr(LS)

–

0.4

–

V/µs

–

Switch off delay time LS

tdr(LS)

µs

–

Fall-time of LS

tf(LS)

µs

–

Slew rate LS switch on

ΔV

OUT/

tf(LS)

–

0.4

–

V/µs

–

Switch on delay time LS

tdf(LS)

120

µs

–

Power Stages - Dynamic Characteristics

6.3

Protection Functions

The device provides integrated protection functions. These are designed to prevent IC destruction under fault

conditions described in the data sheet. Fault conditions are considered as “outside” normal operating range.

Protection functions are not to be used for continuous or repetitive operation, with the exception of the current

limitation (Chapter 6.3.4). Overvoltage, overtemperature and overcurrent are indicated by switching the open

drain output ST to low. Although the slew rate is defined as above (Chapter 6.2.3), in case of overvoltage and

overcurrent the device will have a higher slew rate of typically 11V/µs.

In the following the protection functions are listed in order of their priority. Overvoltage lock out overrides all other

error modes.

6.3.1

Overvoltage Lock Out

To assure a high immunity against overvoltages (e.g. load dump conditions) the device shuts both lowside

MOSFETs off and turns both highside MOSFET on, if the supply voltage

S is exceeding the over voltage

protection level VOV(OFF). The IC operates in normal mode again with a hysteresis VOV(HY) if the supply voltage

decreases below the switch-on voltage

OV(ON). This behavior of the BTM7745G will lead to freewheeling in

highside during over voltage.

S = 13.5V, Tj = +150 °C,RLoad = 12 Ω, VINH = 5V, VS pins shorted, all voltages with respect to ground, positive

current flowing into pin (unless otherwise specified)

6.2.7

6.2.8

6.2.9

6.2.10

6.2.11

6.2.12

6.2.13

6.2.14

6.2.15

6.2.16

6.2.17

6.2.18

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