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PDF U6083B Data sheet ( Hoja de datos )
| Número de pieza | U6083B | |
| Descripción | PWM Power Control IC with Interference Suppression | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Pulse-width Modulation up to 2 kHz Clock Frequency
• Protection Against Short-circuit, Load Dump Overvoltage and Reverse VS
• Duty Cycle 18 to 100% Continuously
• Internally Reduced Pulse Slope of Lamp's Voltage
• Interference and Damage Protection According to VDE 0839 and ISO/TR 7637/1
• Charge-pump Noise Suppression
• Ground-wire Breakage Protection
Description
The U6083B is a PWM IC in bipolar technology for the control of an N-channel power
MOSFET used as a high-side switch. The IC is ideal for use in brightness control sys-
tems (dimming) of lamps, for example, in dashboard applications.
PWM Power
Control IC with
Interference
Suppression
U6083B
Rev. 4770A–AUTO–11/03
1 page  
Example for Oscillator
Frequency Calculation
Calculation Example
Oscillator Frequency
U6083B
Switching thresholds
VT100
VT100
VT<100
VT<100
VTL
VTL
where
= High switching threshold (100% duty cycle)
= VS ´ a1 = (VBatt - IS ´ R3) ´ a1
= High switching threshold (< 100% duty cycle)
= VS ´ a2 = (VBatt - IS ´ R3) ´ a2
= Low switching threshold
= VS ´ a3 = (VBatt - IS ´ R3) ´ a3
a1, a2 and a3 are fixed values
The above mentioned threshold voltages are calculated for the following values given in
the data sheet.
VBatt
VT100
VT<100
VTL
= 12 V, IS = 4 mA, R3 = 150 W, a1 = 0.7, a2 = 0.67 and a3 = 0.28
= (12 V - 4 mA ´ 150 W) ´ 0.7 » 8 V
= 11.4 V ´ 0.67 = 7.6 V
= 11.4 V ´ 0.28 = 3.2 V
3 cases have to be distinguished
1. f1 for duty cycle = 100%, no slope reduction with capacitor C4
(see Figure 4 on page 10)
f1
=
------------------------I--O---S----C------------------------ ,
2 ´ (VT100 – VTL) ´ C2
where
C2
=
68
nF, IOSC
=
45
µA
f1 = ... = 75 Hz
2. f2 for duty cycle < 100%, no slope reduction with capacitor C4
For a duty cycle of less than 100%, the oscillator frequency, f, is as follows:
f2
=
-------------------------I--O----S---C-------------------------- ,
2 ´ (VT<100 – VTL) ´ C2
where
C2
=
68
nF,
IOSC =
45
µA
f2 = ... = 69 Hz
3. f3 with duty cycle < 100% with slope reduction capacitor C4 (see “Output Slope
Control” on page 6)
f3
=
---------------------------------------------I-o---s--c---------------------------------------------
2 ´ (VT<100 – VTL) ´ C2 + 2VBatt ´ C4
where C2 = 68 nF, IOSC = 45 µA, C4 = 1.8 nF
f3 = ... = 70 Hz
By selecting different values of C2 and C4, it is possible to have a range of oscillator fre-
quencies from 10 to 2000 Hz as shown in the data sheet.
4770A–AUTO–11/03
5
5 Page 
Ordering Information
Extended Type Number
U6083B
Package
DIP8
Remarks
–
Package Information
Package DIP8
Dimensions in mm 9.8
9.5
1.64
1.44
7.77
7.47
4.8 max
0.5 min 3.3
0.58
0.48
2.54
7.62
85
6.4 max
0.36 max
9.8
8.2
technical drawings
according to DIN
specifications
14
U6083B
4770A–AUTO–11/03
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet U6083B.PDF ] | |
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