LB1948MCGEVB

LB1948MC
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7
Thermal Shutdown Circuit Block Diagram
Vref
Reference
voltage
circuit
Thermal
shutdown
circuit
Drive circuit
Function equivalent circuit
Note: The above is an example of thermal shutdown circuits although there are some differences from the actual internal
circuit.
Thermal Shutdown Operation
The thermal shutdown circuit compares the voltage of the heat sensitive element (diode) with the reference voltage and
shuts off the drive circuit at a certain temperature to protect the IC chip from overheating.
I
CC
-- V
CC
I
IN
-- V
IN
V
O
(sat) -- I
O
I
CC
-- Ta
40
0
10
20
30
0 5 10 15 20 0 5 10 15 20
400
0
100
200
300
0.6
0
0.1
0.3
0.5
0.2
0.4
0 100 200 300 400 500 600
40
0
10
20
30
-40 -20 0 20 40 60 80 100 120 140
V
IN
=
5V
(=
IN1 / IN2 or IN3 / IN4)
H / H
H / L, L /H
L / L
V
CC
=
12V
IN1~4
V
CC
=
12V
V
CC
=
12V
(IN1 / 2) H /H
H / L, L /H
Current drain, I
CC
-- mA
Supply voltage, V
CC
-- V
Input current, I
IN
-- μA
Input voltage, V
IN
-- V
Output saturation voltage, V
O
(sat) -- V
Current drain, I
CC
-- mA
Output current, I
O
-- mA
Ambient temperature, Ta -- °C
High side and Low side
LB1948MC
www.onsemi.com
8
0
0.1
0.2
0.3
0.4
0.5
0.7
0.6
0 40 80 12020 60 100 140
V
CC
=
12V
High side and Low side
I
O
=
400mA
300mA
200mA
100mA
V
O
(sat) -- Ta
-20-40
Output saturation voltage, V
O
(sat) -- V
Ambient temperature, Ta -- °C
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LB1948MCGEVB

Mfr. #:
Manufacturer:
ON Semiconductor
Description:
Power Management IC Development Tools EVABORD FOR LB1948MC
Lifecycle:
New from this manufacturer.
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