2436 ALLEGRO
Document overview
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Technical content
— FOR REFERENCE ONLY Dwg. No. PS-016 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. I 2L 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. The Darlington-connected output driver is capable of switching loads up to 400 mA.
FEATURES
n 28 V/400 mA Output Switch n Low-Cost Ceramic Timing Capacitor n Dual-Mode Timing Operation n -40°C to +85°C Operation n 10 V to 16 V Operation n Internal Stabilizing Regulator n Low-Cost 8-Pin Mini-DIP 2436 4 5 TOGGLE GROUND OUTPUT OSC. SUPPLY MODE SELECT NO CONNECTION NO CONNECTION VREG COUNTER F/F Always order by complete part number:ULQ2436M . Dwg. No. PS-016 COUNTDOWN POWER TIMER Data Sheet 27462.20A
APPLICATIONS
n Automotive Rear-Window Defogger Timer n Automotive Courtesy Light Timer n Appliance Power Timer n Power Control System ABSOLUTE MAXIMUM RATINGS at TA = +25°C Package Power Dissipation, Operating Temperature Range, Storage Temperature Range,
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000 ELECTRICAL SPECIFICATIONS at TA = -40°C to +85°C, VCC = 12 V (unless otherwise specified). Limits Characteristic Test Conditions Min. Max. Units Regulator Voltage I REG = 12 mA, Output Off 7.0 9.0 V Output Saturation Voltage I OUT = 400 mA, TA = +25°C — 2.5 V IOUT = 250 mA, TA = +25°C — 1.35 V Output Leakage Current V OUT = 28 V, VCC = 12 V — 100 µA VOUT = 22 V, VCC = Open Circuit — 100 µA Input Threshold Voltage 10 k Ω Series Resistor 1.0 5.0 V Oscillator Tolerance T A = +25°C— ±3.0 % Initial Timeout 4064 4064 — Subsequent Timeouts 2032 2032 — Divider Count (VCC = 10 V to 16 V) Dwg. ES-012A TEST CIRCUIT AND TYPICAL REAR-WINDOW DEFOGGER APPLICATION C 0.1 mF T R 1 kWS C S
65 W , 65 mH
R 1.5 MW T 10 kW Dwg. GP-009-1B 50 75 100 125 150 0.5 ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS TEMPERATURE IN °C 2.0 1.5 1.0 R = 55°C/WqJC FREE AIR, R = 80°C/WqJA W Copyright © 1987, 1993, Allegro MicroSystems, Inc.
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 R TC T with the overall output time period (after the digital countdown) of t = 4064 R TC T 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”. 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 (R S). An internal 8 volt Zener diode shunt regulator provides a stable supply to the device over wide supply voltage varia- tions. Capacitor C S 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 REG ), the timer will repeat the preset time delay each time it is activated. Dwg. No. ES-013 COURTESY LIGHT TIMER 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.