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U6084B-FP Schematic ( PDF Datasheet ) - ATMEL Corporation

Teilenummer U6084B-FP
Beschreibung PWM Power Control with Automatic Duty-cycle Reduction
Hersteller ATMEL Corporation
Logo ATMEL Corporation Logo 




Gesamt 10 Seiten
U6084B-FP Datasheet, Funktion
Features
Pulse-width Modulation up to 2 kHz Clock Frequency
Protection against Short-circuit, Load-dump Overvoltage and Reverse VS
Duty-cycle 0 to 100% Continuously
Output Stage for Power MOSFET
Interference and Damage Protection According to VDE 0839 and ISO/TR 7637/1
Charge-pump Noise Suppressed
Ground-wire Breakage Protection
Description
The U6084B is a PWM-IC with bipolar technology 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 constant
brightness, the preselected duty-cycle can be reduced automatically as a function of
the supply voltage.
Figure 1. Block Diagram with External Circuit
VS
16
9
Short circuit
latch monitoring
5
6
C1 47 k
RC oscillator
Control input
3
C5
11
Current monitoring
+ short circuit detection
12
PWM
Logic
Charge 13
pump
14
Output
C2
Duty cycle
range
0-100%
Duty cycle
reduction
Voltage
monitoring
Enable/
disable
4 12
Rsh
VBatt
C3
47 nF
PWM Power
Control with
Automatic
Duty-cycle
Reduction
U6084B
150
R3
Ground
Rev. 4677B–AUTO–02/04






U6084B-FP Datasheet, Funktion
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability
Parameters
Symbol
Value
Unit
Junction temperature
Ambient temperature range
Storage temperature range
Tj
Tamb
Tstg
150
-40 to +110
-55 to +125
°C
°C
°C
Thermal Resistance
Parameters
Junction ambient
Symbol
RthJA
Value
120
Unit
K/W
Electrical Characteristics
Tamb = -40 to +110°C, VBatt = 9 to 16.5 V, (basic function is guaranteed between 6.0 V to 9.0 V) reference point ground,
unless otherwise specified (see Figure 1 on page 1). All other values refer to pin GND (pin 1).
Parameters
Test Conditions
Symbol
Min.
Typ.
Max. Unit
Current consumption
Supply voltage
Stabilized voltage
Battery undervoltage detection
Pin 16
Overvoltage detection, stage 1
IS = 10 mA, pin 16
- on
- off
IS
VBatt
VS
VBatt
6.8 mA
25 V
24.5 27.0 V
4.4
4.8
5.0
5.4
5.6
6.0
V
Battery Overvoltage Detection
Pin 2
Stage 1:
- on
- off
VBatt
18.3 20.0 21.7
16.7 18.5 20.3
V
Stage 2:
- on
- off
VBatt
25.5 28.5 32.5
19.5 23.0 26.5
V
Stabilized voltage
Short-circuit Protection
IS = 30 mA, pin 16
Pin 12
VZ
18.5 20.0 21.5
V
Short-circuit current limitation
Short-circuit detection
VT1 = VS - V12
VT2 = VS - V12
Delay Timer Short-circuit Detection Pin 11
VT1
VT2
VT1 - VT2
85
75
3
100 120 mV
90 105 mV
10 30 mV
Switched off threshold
Charge current
Discharge current
Capacitance current
Output short-circuit latch
VT11 = VS - V11
I5 = Ich - Idis
Pin 9
VT11
Ich
Idis
I5
9.5 9.8 10.1 V
23 µA
3 µA
13 20 27 mA
Saturation voltage
I9 = 100 µA
Notes: 1. Reference point is battery ground
Vsat 150 350 mV
6 U6084B
4677B–AUTO–02/04

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