ULQ2436M [ALLEGRO]
COUNTDOWN POWER TIMER; COUNTDOWN电源计时器
| 型号： | ULQ2436M |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | COUNTDOWN POWER TIMER |
| 文件： | 总3页 (文件大小：82K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
2436
COUNTDOWN POWER TIMER
The ULQ2436M is a rugged, long-duration countdown timer
specifically designed to operate in an automotive or industrial environ-
ment. It uses an internal RC oscillator to drive a digital countdown
circuit for timing periods of typically 2-1/2 to 5 minutes. The
ULQ2436M multiplies the oscillator period by 4064. Internal logic can
automatically cause the timeout to be halved for successive timeouts.
I2L technology is used for the countdown and logic circuitry and
conventional linear bipolar devices for the oscillator and output power
functions. This combination, together with the low-cost 8-pin mini-DIP
plastic package, results in a very economical power timer suitable for a
wide variety of applications.
1
2
3
4
8
7
6
5
OSC.
GROUND
OUTPUT
TOGGLE
MODE SELECT
NO
CONNECTION
NO
CONNECTION
F/F
V
SUPPLY
REG
Dwg. No. PS-016
The Darlington-connected output driver is capable of switching
loads up to 400 mA.
FEATURES
■ 28 V/400 mA Output Switch
■ Low-Cost Ceramic Timing Capacitor
■ Dual-Mode Timing Operation
■ -40°C to +85°C Operation
■ 10 V to 16 V Operation
■ Internal Stabilizing Regulator
■ Low-Cost 8-Pin Mini-DIP
APPLICATIONS
■ Automotive Rear-Window Defogger Timer
■ Automotive Courtesy Light Timer
■ Appliance Power Timer
ABSOLUTE MAXIMUM RATINGS
at T = +25°C
A
Supply Current, IREG . . . . . . . . . . . . 15 mA
Output Voltage, VOUT . . . . . . . . . . . . . 28 V
Output Current, IOUT . . . . . . . . . . . 400 mA
■ Power Control System
Input Voltage, V1 or V4 (2 min.) . . . . . 24 V
(continuous) . . . . . . . . . . . . . . . . . 16 V
Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
TA . . . . . . . . . . . . . . . . -40°C to +85°C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . -65°C to +150°C
Always order by complete part number: ULQ2436M .
2436
COUNTDOWN POWER TIMER
2.0
TEST CIRCUIT AND TYPICAL
REAR-WINDOW DEFOGGER APPLICATION
R
= 55°C/W
θJC
V
1.5
CC
R
1 kΩ
S
+
R
T
1.0
0.5
0
1.5 MΩ
1 µF
C
S
1
8
7
6
5
C
0.1 µF
T
FREE AIR, R
θJA
= 80°C/W
2
3
4
65 Ω, 65 mH
TOGGLE
24 V
10 kΩ
10 kΩ
F/F
V
25
50
75
100
125
150
REG
TEMPERATURE IN °C
Dwg. GP-009-1B
Dwg. ES-012A
ELECTRICAL SPECIFICATIONS at TA = -40°C to +85°C, VCC = 12 V
(unless otherwise specified).
Limits
Max.
9.0
Characteristic
Test Conditions
REG = 12 mA, Output Off
OUT = 400 mA, TA = +25°C
Min.
7.0
—
Units
V
Regulator Voltage
Output Saturation Voltage
I
I
2.5
V
IOUT = 250 mA, TA = +25°C
—
1.35
100
V
Output Leakage Current
VOUT = 28 V, VCC = 12 V
—
µA
µA
V
VOUT = 22 V, VCC = Open Circuit
—
100
Input Threshold Voltage
Oscillator Tolerance
10 kΩ Series Resistor
TA = +25°C
1.0
—
5.0
±3.0
±6.0
4064
2032
%
TA = -40°C to +85°C
Initial Timeout
—
%
Divider Count
(VCC = 10 V to 16 V)
4064
2032
—
—
Subsequent Timeouts
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1987, 1993, Allegro MicroSystems, Inc.
2436
COUNTDOWN POWER TIMER
CIRCUIT DESCRIPTION
COURTESY LIGHT TIMER
OSC. An external resistor in the range of
200 kΩ to 2 MΩ and an external capacitor
in the range of 0.001 µF to 1 µF determine
the frequency of the internal oscillator. The
period of oscillation is nominally RTCT with
the overall output time period (after the
digital countdown) of
BATTERY
1 kΩ
+
R
T
1 µF
1
8
7
6
5
C
T
TO
2
t = 4064 RTCT
COURTESY
LIGHT
3
where t is in seconds. See also MODE
SELECT.
16 V
F/F
4
V
REG
10 kΩ
OUTPUT. The output is an open-collector
of a Darlington-connected transistor. The
output is ON (low) during the timing period.
An external Zener diode is used to protect
the output against inductive-load switching
transients and automotive “load dump”.
Dwg. No. ES-013
TOGGLE. A push-button, momentary-action
switch at this input toggles the timer from
the OFF to the ON state. The oscillator and
countdown circuitry are started on the rising
edge of the input pulse. Internal de-bounce
circuitry is included.
SUPPLY. The timer requires a supply current
applied to this pin through a current-limiting
resistor (RS). An internal 8 volt Zener diode
shunt regulator provides a stable supply to
the device over wide supply voltage varia-
tions. Capacitor CS is used to provide
decoupling.
MODE SELECT. With MODE SELECT
connected to GROUND, the first activation
will run for the preset time delay. All activa-
tions after the first will time out at half of the
initial preset time. This sequence is reset
each time the supply is interrupted. With
MODE SELECT connected to SUPPLY
(VREG), the timer will repeat the preset time
delay each time it is activated.
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the
detail specifications as may be required to permit improvements in the design of its products.
Components made under military approvals will be in accordance with the approval requirements.
The information included herein is believed to be accurate and reliable. However, Allegro
MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other
rights of third parties which may result from its use.
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