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參數(shù)資料
| 型號： | U2642B |
| 英文描述： | Intermittent- and Wipe/Wash Control for Wiper Systems |
| 中文描述： | 間歇性和擦/清洗控制雨刮器系統(tǒng) |
| 文件頁數(shù)： | 3/10頁 |
| 文件大?。?/td> | 178K |
| 代理商： | U2642B |
U2642B
TELEFUNKEN Semiconductors
Rev. A2, 02-Dec-97
3 (10)
function, wipe/wash mode is activated immediately after
the debounce time, t
D
, even if an on-delay is programmed
(t
DEL
= 0 s). Expiry of t
AW
is directly followed by the next
relay on-time, t
ON
, of intermittent mode.
Oscillator
All timing sequences are derived from an RC-oscillator
whose charging time, t
1
, is determined by an external
resistor R
OSC
and whose discharging time, t
2,
is
determinated by an integrated 2-k resistor. Since
tolerance and temperature response of the integrated
resistor are far higher than those of the external resistor,
t
1
/t
2
must be selected to be greater than 20 for stability
reasons. The minimum value of R
OSC
should not be less
than 68 k .
Calculating cycle duration and frequency:
t = t
1
+ t
2
= C
OSC
and f
OSC
= 1/t
( 0.74
R
OSC
+ 2260 )
Calculating the capacitor for a given resistor:
C
OSC
= t / ( 0.74
R
OSC
+ 2260 )
Calculating the oscillator resistance for a given capacitor:
R
OSC
= 1.34
( t / C
OSC
– 2260 )
Recommended frequency: f
OSC
= 200 Hz
(for R
OSC
= 200 k , C
OSC
= 33 nF)
All times can be varied jointly within specific limits by
varying the oscillator frequency (see table 1). The oscilla-
tor is operable up to 50 Hz.
Power Supply
For reasons related to protection against interference and
destruction, the Pin V
S
must be provided with an RC net-
work for limiting the current in the event of overvoltage
and for buffering in the event of voltage drops.
Proposed ratings: R
V
= 510 , C
V
= 47 F. An integrated
14-V Zener diode is connected between V
S
and GND.
Interference Voltages and Load-Dump
In the case of transients, the integrated Zener diode limits
the voltage of the relay output to approximately 28 V. In
the case of load-dump, a current (dependent upon R
V
and
C
V
) flows through the integrated 14-V Zener diode, and
the relay output is switched on at V
Batt
> 30 V in order to
avoid destruction of the output. The output transistor is
rated such that it can withstand the current generated dur-
ing the load-dump through the relay coil. In practice, the
windscreen wiper motor is switched on via the relay and
thus the amplitude of the load-dump pulse is limited. The
supply voltage of the circuit is limited to 14 V by the inte-
grated Zener diode, and the inputs are protected by
external protective resistors and integrated Zener diodes.
RF suppression is implemented with a low-pass filter at
the inputs, consisting of a protective resistor and the inte-
grated capacitor.
Power-on Reset (POR)
When the supply voltage is applied, a power-on reset
pulse is generated which sets the circuit’s logic to a de-
fined initial state. The POR threshold is approximately
V
S
= 4.3 V.
Table 1. Change in times by varying the oscillator frquency
f
osc (Hz)
100
120
140
160
180
200
220
240
260
280
300
400
t
D
[
ms
]
140
116
100
87
77
70
64
58
54
50
46
35
t
DL
[
ms
]
35
29
25
22
19
17
16
14
13
12
11
9
t
ON
[
ms
]
1280
1066
915
800
710
640
581
533
493
457
426
320
t
INT
[
s
]
20.0
17.0
14.0
12.5
11.0
10.0
9.0
8.2
7.6
7.0
6.5
5.0
t
AW
[
s
]
11.6
9.6
8.3
7.2
6.4
5.8
5.3
4.8
4.5
4.1
3.9
2.9
t
DEL
[
s
]
1680
1400
1200
1050
933
840
763
700
645
600
560
420
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
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| U267BG | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:To drive LED-displays with 5 or 10 diodes |
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