The BTS 781 GP is part of the TrilithIC family containing three dies in one package:
One double high-side switch and two low-side switches. The drains of these three
vertical DMOS chips are mounted on separated leadframes. The sources are connected
to individual pins, so the BTS 781 GP can be used in H-bridge- as well as in any other
configuration. The double high-side is manufactured in SMART SIPMOS
which combines low
R
vertical DMOS power stages with CMOS control circuit. The
DS ON
®
technology
high-side switch is fully protected and contains the control and diagnosis circuit. To
achieve low
R
and fast switching performance, the low-side switches are
DS ON
manufactured in S-FET 2 logic level technology. The equivalent standard product is the
SPD30N06S2L-13.
Data Sheet12002-06-28
Page 2
1.3Pin Configuration
(top view)
BTS 781 GP
Molding
Compound
NC
SL1
IL1
NC
IH1
ST1
SH1
DHVS
GND
IH2
1
2
3
4
5
6
7
8
9
10
Heat-Slug 1
18
DL1
Heat-Slug 2
1716DHVS
ST2
SH2
11
12
Heat-Slug 3
SL2
13
DL2
NC
IL2
Figure 1
Data Sheet22002-06-28
14
15
Page 3
BTS 781 GP
1.4Pin Definitions and Functions
Pin No.SymbolFunction
1NCNot connected
2SL1Source of low-side switch 1
3IL1Analog input of low-side switch 1
4NCNot connected
5IH1Digital input of high-side switch 1
6ST1Status of high-side switch 1; open Drain output
7SH1Source of high-side switch 1
8DHVSDrain of high-side switches and power supply voltage
9GNDGround of high-side switches
10IH2Digital input of high-side switch 2
11ST2Status of high-side switch 2; open Drain output
12SH2Source of high-side switch 2
13SL2Source of low-side switch 2
14NCNot connected
15IL2Analog input of low-side switch 2
16DL2Drain of low-side switch 2
Heat-Slug 3
17DHVSDrain of high-side switches and power supply voltage
Heat-Slug 2
18DL1Drain of low-side switch 1
Heat-Slug 1
Pins written in bold type need power wiring.
Data Sheet32002-06-28
Page 4
1.5Functional Block Diagram
BTS 781 GP
DHVS
ST1
ST2
IH1
IH2
GND
IL1
10
6
11
5
9
8, 17
Diagnosis
Biasing and Protection
Driver
OUT
0IN0 L L
0 1 L H
1 0 H L
1 1 H H
3
R
O1
R
O2
16
18
12
SH2
DL2
7
SH1
DL1
15
IL2
2
SL1
13
SL2
Figure 2
Block Diagram
Data Sheet42002-06-28
Page 5
BTS 781 GP
1.6Circuit Description
Input Circuit
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.
Output Stages
The output stages consist of a low
R
Power-MOS H-bridge. In H-bridge
DS ON
configuration, the D-MOS body diodes can be used for freewheeling when commutating
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.
Short Circuit Protection
The outputs are protected against
– output short circuit to ground
– overload (load short circuit).
An internal OP-amp controls the Drain-Source-voltage by comparing the DS-voltagedrop with an internal reference voltage. Above this trippoint the OP-Amp reduces the
output current depending on the junction temperature and the drop voltage.
In the case of overloaded high-side switches the status output is set to low.
Overtemperature Protection
The high-side switches incorporate an overtemperature protection circuit with hysteresis
which switches off the output transistors and sets the status output to low.
Undervoltage-Lockout (UVLO)
When VS reaches the switch-on voltage V
The high-side output transistors are switched off if the supply voltage
switch off value
V
UVOFF.
the IC becomes active with a hysteresis.
UVON
V
drops below the
S
Open Load Detection
Open load is detected by voltage measurement in off state. If the output voltage exceeds
a specified level the error flag is set with a delay.
Data Sheet52002-06-28
Page 6
BTS 781 GP
Status Flag
The two status flag outputs are an open drain output with Zener-diode which require a
pull-up resistor, c.f. the application circuit on page 15. ST1 and ST2 provide separate
diagnosis for each high-side switch. Various errors as listed in the table “Diagnosis” are
detected by switching the open drain output ST1/2 to low. Forward current in the
integrated body diode of the highside switch may cause undefined voltage levels at the
corresponding status output. The open load detection can be used to detect a short to
Vs as long as both lowside switches are off and R
BCR192W.
2Truthtable and Diagnosis (valid only for the High-Side-Switches)
FlagIH1IH2SH1SH2ST1 ST2 Remarks
InputsOutputs
is disconnected from 5V by
OL
0
Normal operation;
identical with functional truth table
Open load at high-side switch 1
Open load at high-side switch 2
Overtemperature high-side switch1 0
Overtemperature high-side switch2 X
Overtemperature both high-side
switches
UndervoltageXXLL11not detected
0
1
1
0
1
X
X
1
X
0
X
1
0
1
0
1
X
X
0
1
X
X
0
1
0
1
X
L
L
H
H
Z
H
X
X
L
L
X
X
L
L
L
L
H
L
H
X
X
Z
H
X
X
L
L
L
L
L
1
1
1
1
0
1
1
1
1
0
1
1
1
1
0
1
1
1
1
1
1
0
1
1
1detected
1
0detected
1
0
1
stand-by mode
switch2 active
switch1 active
both switches
active
detected
detected
detected
detected
Note: * multiple simultaneous errors are not shown in this table
Inputs:Outputs:Status:
0 = Logic LOWZ = Output in tristate condition1 = No error
The information herein is given to describe certain components and shall not be considered as warranted
characteristics.
Terms of delivery and rights to technical change reserved.
We hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding
circuits, descriptions and charts stated herein.
Infineon Technologies is an approved CECC manufacturer.
Information
For further information on technology, delivery terms and conditions and prices please contact your nearest
Infineon Technologies Office in Germany or our Infineon Technologies Representatives worldwide (see address
list).
Warnings
Due to technical requirements components may contain dangerous substances. For information on the types in
question please contact your nearest Infineon Technologies Office.
Infineon Technologies Components may only be used in life-support devices or systems with the express written
approval of Infineon Technologies, if a failure of such components can reasonably be expected to cause the
failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. Life
support devices or systems are intended to be implanted in the human body, or to support and/or maintain and
sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other
persons may be endangered.
Data Sheet172002-06-28
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