BTM 7811K Infineon Technologies, BTM 7811K Datasheet - Page 8

• Manufacturer Part Number: BTM 7811K
• Manufacturer: Infineon Technologies

Specifications of BTM 7811K

• Packages: PG-TO263-15
• Operating Range: 5.0 - 42.0 V
• Rds (on) (typ): 40.0 mOhm
• Id(lim): 42.0 A
• Iq (typ): 4.0 µA
• Diagnosis: OT, OL Status Flag

4
4.1
The control inputs IH1,2 consist of TTL/CMOS compatible Schmitt-Triggers with hysteresis. Buffer amplifiers are
driven by these stages and convert the logic signal into the necessary form for driving the power output stages.
The inputs are protected by ESD clamp-diodes. The inputs IL1 and IL2 are connected to the gates of the standard
N-channel vertical power-MOS-FETs.
4.2
The output stages consist of an low
diodes can be used for freewheeling when communicating inductive loads. If the high-side switches are used as
single switches, positive and negative voltage spikes which occur when driving inductive loads are limited by
integrated power clamp diodes.
4.3
The outputs are protected against short circuit to ground and short circuit over load.
In short circuit to ground and short circuit over load situation the HS switches will limit the load current. Due to the
high power dissipation in short circuit situation the junction temperature will rise. The over temperature protection
function will switch off the output transistors if the junction temperature reaches the over temperature shutdown
limit.
4.4
The high-side switches also incorporate an over temperature protection circuit with hysteresis which switches off
the output transistors and sets the status output to low.
4.5
When
transistors are switched off if the supply voltage
4.6
The open load detection of the BTM7811K works in OFF condition and is based on a voltage measurement at the
source of the high side switch. In order to use the open load detection SH2 has to be connected to Vcc via a pull
up resistor. Because this pull up resistor would connect the bridge output to the µC supply it needs to be
disconnected whenever the high side switch is on. This can be done by a transistor as shown in the application
example
•
•
•
If the load is connected properly it will pull down the voltage at SH2 to a value close to 0V.
If the load is disconnected the resistor will pull the voltage at SH2 to value close to Vcc.
If the voltage at SH2 is higher than the open load detection voltage
Data Sheet
Set IH1 = IH2 = LOW (both high side switches off)
Set IL2 = LOW, IL1 = HIGH (only low side switch 1 is on)
Connect
V
S
(Figure 5 “Application Example BTM7811K” on Page
reaches the switch-on voltage
R
Output Stages
Circuit Description
Input Circuit
Short Circuit Protection
Overtemperature Protection
Undervoltage Lockout
Open Load Detection
ol
(open load pull up) to 5V via transistor
R
DSON
V
UVON
Power-MOS H-bridge. In H-bridge configuration, the D-MOS body
V
the IC becomes active with a hysteresis. The high-side output
S
drops below the switch off value
8
16). To check for open load:
V
OUT(OL)
then ST will be pulled down.
V
UVOFF
.
Rev. 1.0, 2008-05-15
BTM7811K