Data Sheet

23

Rev. 1.0, 2009-03-31

High Current PN Half Bridge

BTN7975B

Application Information

6.3

Half-bridge Configuration Considerations

Please note that, if the BTN7975B is used in a half-bridge configuration with the load connected between OUT

and GND and the supply voltage is exceeding the Overvoltage Switch-OFF level

V

“Overvoltage Lock Out” feature leads to automatically turning on the high side switch, while turning off the low

side switch, and therefore connecting the load to

V

also “Truth Table” on Page 20). This will lead to current flowing through the load, if not otherwise configured.

It shall be insured that the power dissipated in the NovalithIC™ does not exceed the maximum ratings. For further

explanations see the application note “BTN79x0 Over Voltage (OV) Operation”.

Figure 15

Application Example: Half-Bridge with a BTN7975B (Load to GND)

Note: This is a simplified example of an application circuit. The function must be verified in the real application.

M

TLE

4278G

V

S

I/O

Reset

Vdd

Vss

WO

RO

Q

D

GND

I

SPD

50P03L

Microcontroller

Reverse Polarity

Protection

Voltage Regulator

High Current Half-Bridge

I/O

I/O

I/O

VS

OUT

INH

IN

ST

SR

GND

BTN7975

C

S

470µF

R

1

1k

Ω

D

Z1

10V

470nF

R

IN

10k

Ω

R

INH

10k

Ω

R

SR

0..51k

Ω

R

ST

1k

Ω

C

Q

22µF

C

D

47nF

XC866