CR636 | Alternator regulator for 14 V systems with RVC interface

11.0 – 15.5 V set voltage via PWM interface

CR636 regulates the output voltage of a 14 V alternator to a constant value.

The regulator continuously senses the alternator’s output voltage, rpm, temperature, excitation current.

It adjusts the excitation current to keep the output voltage on a constant level. Via PWM commands, the output voltage can be set to any desired value within the given range.

Benefits

Fully integrated alternator regulator

Pulse-width modulated regulator

Load response function

Technical Features


Type	Voltage regulator for 14 V alternators
Package	MultiWatt8
Robustness of operation	Wake-up from V terminal if communication is missing
Function to protect alternator and battery	Power stage shutdown at extreme temperature Short circuit protection / recovery on DF power stage
Features	High-side DMOS regulated dynamo field (DF) by fixed frequency PWM Integrated active freewheeling MOSFET on DF DF duty cycle range up to 90 % LR slow loads LR Boost and fast loads Active handling of over-voltage Accepts jump start with 28 V
Communication features	RVC interface acc. to GM specification GMW14036 + Update GMW8778
Operating voltage	6.5 – 18 V
Extended operating voltage	4 – 37 V
Set voltage or B+	11.0 – 15.5 V
Setting	PWM
Regulation	Digital
Freewheeling	Active
Load response	Yes
High temperature shut-off	Yes
ESD handling	all pins: ±8 kV (HBM, 1.5 kOhm, 100 pF to GND)
Field protection	Yes
Tj min [°C]	-40°C
Tj max [°C]	150°C

MultiWatt 8 (in-line)

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