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U6084B の電気的特性と機能

U6084BのメーカーはTEMIC Semiconductorsです、この部品の機能は「PWM Power Control with Automatic Duty Cycle Reduction」です。


製品の詳細 ( Datasheet PDF )

部品番号 U6084B
部品説明 PWM Power Control with Automatic Duty Cycle Reduction
メーカ TEMIC Semiconductors
ロゴ TEMIC Semiconductors ロゴ 




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U6084B Datasheet, U6084B PDF,ピン配置, 機能
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 VS
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
VS
16
9
Short circuit
latch monitoring
5
6
C1 47 kW
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
C6
95 9751
Rsh
VBatt
C3
47 nF
150W R3
Figure 1. Block diagram with external circuit
Ground
TELEFUNKEN Semiconductors
Rev. A1, 14-Feb-97
1 (8)

1 Page





U6084B pdf, ピン配列
U6084B
charged with a constant current, I, until the upper switch-
ing threshold is reached. A second current source is then
activated which taps a double current, 2 I, from the
charging current. The capacitor, C2, is thus discharged by
the current, I, until the lower switching threshold is
reached. The second source is then switched off again and
the procedure starts once more.
Example for Oscillator Frequency Calculation
+ a + * aVT100
VS
1 (VBatt IS R3)
1
+ a + * a¦VT 100
VS
2 (VBatt IS R3)
2
+ a + * aVTL VS
3 (VBatt IS R3)
3
where
+VT100 High switching threshold (100% duty cycle)
+ ttVT 100 High switching threshold ( 100% duty cycle)
+VTL Low switching threshold
a a a1, 2 and 3 are fixed constant.
The above mentioned threshold voltages are calculated
for the following values given in the data sheet.
WVBatt = 12 V, IS = 4 mA, R3 = 150 ,
a a a1 = 0.7, 2 = 0.67 and 3 = 0.28.
+ * WVT100 (12 V 4 mA 150 )
+ +tVT 100 11.4 V 0.67 7.6 V
+ +VTL 11.4 V 0.28 3.2 V
[0.7 8 V
For a duty cycle of 100%, an oscillator frequency, f, is
as follows:
+f 2
*Iosc
(VT100 VTL)
++ mC2
, where C2
and Iosc
22 nF
40 A
Therefore:
+ * mf
40 A
2 (8 V 3.2 V)
+22 nF 189 Hz
For a duty cycle of less than 100%, the oscillator fre-
quency, f, is as follows:
+ * )tf
Iosc
2 (VT 100 VTL) C2 4 VBatt C4
whereas C4 = 470 pF
+ ǒ * Ǔ )40 mA
2 7.6 V 3.2 V 22 nF 4 12 V 470 pF
+ 185 Hz
A selection of different values of C2 and C4, provides a
range of oscillator frequency, f, from 10 to 2000 Hz.
Pins 7, 8, 10 and 15
Not connected.
Pin 9, Status Short Circuit Latch
The status of the short-circuit latch can be monitored via
Pin 9 (open collector output).
Pin 9
L
H
Function
Short-circuit detected
No short-circuit detected
Pins 11 and 12, Short-Circuit Protection
and Current Sensing
1. Short-Circuit Detection and Time Delay, td
The lamp current is monitored by means of an external
shunt resistor. If the lamp current exceeds the threshold
for the short-circuit detection circuit (VT2 90 mV), the
mduty cycle is switched over to 100% and the capacitor C5
is charged by a current source of 20 A (Ich – Idis). The
external FET is switched off after the cut-off threshold
(VT11) is reached. Renewed switching on the FET is pos-
sible only after a power-on reset. The current source, Idis,
ensures that the capacitor C5 is not charged by parasitic
currents. The capacitor C5 is discharged by Idis to typ.
0.7 V.
Time delay, td, is as follows:
+ @ * ń *td C5 (VT11 0.7 V) (Ich Idis)
With C5 = 330 nF and VBatt = 12 V, we have
+ @ * ń mtd 330 nF (9.8 V 0.7 V) 20 A
+ 150 ms.
TELEFUNKEN Semiconductors
Rev. A1, 14-Feb-97
3 (8)


3Pages


U6084B 電子部品, 半導体
U6084B
Application
Figure 2.
6 (8) TELEFUNKEN Semiconductors
Rev. A1, 14-Feb-97

6 Page



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共有リンク

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部品番号部品説明メーカ
U6084B

PWM Power Control with Automatic Duty-cycle Reduction

ATMEL Corporation
ATMEL Corporation
U6084B

PWM Power Control with Automatic Duty Cycle Reduction

TEMIC Semiconductors
TEMIC Semiconductors
U6084B-FP

PWM Power Control with Automatic Duty-cycle Reduction

ATMEL Corporation
ATMEL Corporation
U6084B-FP

PWM Power Control with Automatic Duty Cycle Reduction

TEMIC Semiconductors
TEMIC Semiconductors


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