BTN7971B Datasheet, PDF (23/26 Pages) Infineon Technologies AG – High Current PN Half Bridge NovalithIC

High Current PN Half Bridge
BTN7971B
Application Information
6.3
Half-bridge Configuration Considerations
Please note that, if the BTN7971B 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_OV(OFF), the implemented
“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_S; independently of the current IN- and INH-pin signals (see
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”.
Microcontroller
XC866
I/O I/O
I/O
Reset
Vdd
C
Q
22µF
I/O ^Vss
C
D
47nF
Voltage Regulator
Reverse Polarity
Protection
WO _{TLE I}
RO _4278G
Q
D _GND
D
Z1
10V
C
S
470µF
R₁
1kΩ
V_S
IPB
100P03P3L-
04
R_IN
10kΩ
R
10k^INΩ^H
R_IS
1kΩ
R_{S R}
0..51kΩ
BTN7971B
VS
INH
IN
OUT
IS
SR
GND
C
Sc
470nF
M
High Current Half-Bridge
Figure 15 Application Example: Half-Bridge with a BTN7971B (Load to GND)
Note: This is a simplified example of an application circuit. The function must be verified in the real application.
Data Sheet
23
Rev. 2.0, 2008-06-27