U6084B Datasheet, PDF (1/8 Pages) ATMEL Corporation – PWM Power Control with Automatic Duty-cycle Reduction

U6084B
PWM Power Control with Automatic Duty Cycle Reduction
Description
The U6084B is a bipolar technology PWM-IC designed
for the control of an N-channel power MOSFET used as
a high-side switch. The IC is ideal for use in the brightness
control (dimming) of lamps such as, in dashboard
applications. For a constant brightness the preselected
duty cycle can be reduced automatically as a function of
the supply voltage.
Features
D Pulse width modulation up to 2 kHz clock frequency
D Protection against short circuit, load-dump
overvoltage and reverse V_S
D Duty cycle 0 to 100 % continuously
D Output stage for power MOSFET
D Interference and damage protection according to
VDE 0839 and ISO/TR 7637/1.
D Charge pump noise suppressed
D Ground wire breakage protection
Ordering Information
Extended Type Number
U6084B–FP
Package
SO16
Remarks
Block Diagram
V_S
16
9
Short circuit
latch monitoring
5
6
C₁
47 kW
RC oscillator
Control input
3
C₅
R_sh
11
Current monitoring
12
+ short circuit detection
PWM
Logic
Charge ¹³
pump
14
Output
C₂
Duty cycle
range
0–100%
Duty cycle
reduction
Voltage
monitoring
Enable/
disable
4
1
2
C₆
95 9751
V_Batt
C₃
47 nF
150W R₃
Figure 1. Block diagram with external circuit
Ground
TELEFUNKEN Semiconductors
1 (8)
Rev. A1, 14-Feb-97