U2352B
PWM Power Control for DC Loads
Description
The U2352B bipolar circuit is a PWM device for control-
ling logic level Power MOSFETs and IGBTs. It allows
simple power control for dc loads. Integrated load current
monitoring with adjustable switch-off threshold also
gives the option of measuring the load current via the
MOS transistor’s on-state resistance, R
DS(on)
, or via a
shunt resistor.
Special Features
D
Pulse width control up to 50 kHz clock frequency
D
Load current monitoring via the on-state resistance,
R
DS(on)
, of the FET or via shunt resistor (optional)
Applications
D
D
D
D
D
D
Battery-operated screwdrivers
Battery-operated machine tools
Halogen lamp controllers
Dimmers
Electronic fuses
High-performance clock generators
D
100 mA push-pull output stage
D
Voltage monitoring
D
Temperature-compensated supply voltage limitation
D
Chip temperature monitoring
Package:
DIP8, SO8
V
S
2xI
Chip
temperature
monitoring
140°C
Reference
voltage
8
V
S
S
1
1
Oscillator
Voltage
limitation 6.8 V
I
–
2
K1
+
Output stage
logic
Push-pull
output stage
7
Time window
current measurement
3
–
K2
+
Load current
monitoring
4
S
2
Q
S
Q
R
6
GND
POR
5
95 9670
Figure 1. Block diagram
TELEFUNKEN Semiconductors
Rev. A1, 29-May-96
1 (8)
TEMIC [ TEMIC SEMICONDUCTORS ]
