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Bosch Semiconductors for Automotive

CR724

Alternator regulator for 14V systems

Application & Technical Summary

CF190

CR724 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.

Product benefits

  • Fully integrated alternator regulator
  • MFR multi functional regulator
  • Load response function
  • Multiwatt8 package
  • Various customer programming options at end of line

14.1 – 14.55 V regulation voltage

regulation voltage set at end of line

Technical Features

Type
Voltage regulator for 14V alternators
Package
MultiWatt8
Functions to protect alternator and battery

  • Power stage shutdown at extreme temperature
  • Short circuit protection / recovery on DF power stage

Features

  • Power stage shutdown at extreme temperature
  • Short circuit protection / recovery on DF power stage
  • High-side DMOS regulated dynamo field (DF) by fixed
    frequency PWM
  • Integrated active freewheeling MOSFET on DF
  • DF duty cycle range up to 100 %
  • LR slow loads
  • LR Boost and fast loads
  • Active handling of over-voltage
  • Accepts jump start with 28 V

Operating voltage
6.5 – 18 V
Extended operating voltage
4 – 37 V
Set voltage or B+
14.1 – 14.55 V
Setting
Fixed at end of line
Regulation
Digital
Freewheeling
Active
Load response
Yes
High temperature shut-off
Yes
ESD handling
all pins: ±4 kV (HBM,
1.5 kOhm, 100 pF to GND)
Field protection
Yes
Tj min [°C]
-40°C
Tj max [°C]
150°C

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