ULQ2436: Countdown Power Timer

2436
2436
Data Sheet
27462.20A
COUNTDOWN POWER TIMER
OSC.
1
GROUND
2
OUTPUT
3
TOGGLE
4
COUNTER
COUNTDOWN POWER TIMER
F/F
VREG
8
MODE SELECT
7
NO
CONNECTION
6
NO
CONNECTION
5
SUPPLY
Dwg. No. PS-016
Dwg. No. PS-016
T
C
The ULQ2436M is a rugged, long-duration countdown timer
specifically designed to operate in an automotive or industrial environment. 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.
U
D
O
R
P
O
E
C
D
E N
U RE
N
I
T FE
N E
O
R
C
R
S
I
O
D F
—
■
■
■
■
■
■
■
Supply Current, IREG . . . . . . . . . . . .
15 mA
Output Voltage, VOUT . . . . . . . . . . . . . 28 V
Output Current, IOUT . . . . . . . . . . .
N
The Darlington-connected output driver is capable of switching
loads up to 400 mA.
FEATURES
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Y
L
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
Power Control System
400 mA
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
2.0
TEST CIRCUIT AND TYPICAL
REAR-WINDOW DEFOGGER APPLICATION
RθJC = 55°C/W
V CC
1.5
50
75
100
TEMPERATURE IN °C
CS 1 µF
1
CT
0.1 µF
FREE AIR, RθJA = 80°C/W
65 Ω, 65 mH
TOGGLE
0
25
+
RT
1.5 MΩ
1.0
0.5
R S 1 kΩ
125
COUNTER
ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS
COUNTDOWN POWER TIMER
2
10 kΩ
24 V
3
4
150
8
7
6
F/F
VREG
5
10 kΩ
Dwg. GP-009-1B
Dwg. ES-012A
ELECTRICAL SPECIFICATIONS at TA = -40°C to +85°C, VCC = 12 V
(unless otherwise specified).
Limits
Characteristic
Test Conditions
Min.
Max.
Units
Regulator Voltage
IREG = 12 mA, Output Off
7.0
9.0
V
Output Saturation Voltage
IOUT = 400 mA, TA = +25°C
—
2.5
V
IOUT = 250 mA, TA = +25°C
—
1.35
V
VOUT = 28 V, VCC = 12 V
—
100
µA
VOUT = 22 V, VCC = Open Circuit
—
100
µA
Input Threshold Voltage
10 kΩ Series Resistor
1.0
5.0
V
Oscillator Tolerance
TA = +25°C
—
±3.0
%
TA = -40°C to +85°C
—
±6.0
%
Initial Timeout
4064
4064
—
Subsequent Timeouts
2032
2032
—
Output Leakage Current
Divider Count
(VCC = 10 V to 16 V)
115 Northeast Cutoff, Box 15036
W
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
+
1 µF
R T
COUNTER
1
C T
t = 4064 RTCT
TO
COURTESY
LIGHT
2
where t is in seconds. See also MODE
SELECT.
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”.
3
8
7
6
16 V
4
F/F
VREG
5
10 kΩ
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 variations. 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 activations 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.