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This Alternator Regulator is specifically designed for voltage regulation in alternator
charging systems with rich features suitable for automotive application.
Features
¡ Initial Soft Start function
¡ LRC 5 Sec
¡ Capable of regulating voltage within ±0.2 V @ 25°C
¡ Load Dump protection of lamp driver, field driver and loads
¡ Under-Voltage, Over-Voltage and phase loss detection
¡ Provides Low side MOSFET driver control
¡ Field short protection
¡ < 0.5 mA standby current from battery @ 25°C
¡ Thermal shutdown protection
¡ SOP-10 package
Description
N.K D-01 is specifically designed for voltage regulation in alternator charging systems, as commonly found in automotive applications.
N.K D-01 provides a regulated voltage feedback system to monitor and compare the system battery voltage to an externally programmed set point value and generate PWM waveform to drive external N–channel MOSFET to control the average alternator field current in response to system load current.
N.K D-01 provides Initial Soft Start functions to eliminate engine torque.
Pin Connection
SOP-10 N.K D-01
System Diagram and Pin Connect
Internal Block Diagram
Electrical Characteristics
Maximum Rating
DC Characteristics
AC and Switch Characteristics
.Functional Description
Power on / Down
Power is applied to UL8813 through the Vbat Pin (Pin 9). The condition of power-up and
power-down is decided by the IGN Pin (Pin 5). When the voltage at IGN Pin is above 0.7 V
(typically), the IC is guaranteed to be fully operational. When the voltage is below 0.7 V at
IGN, the IC is guaranteed to be in a low current standby mode.
Soft-start
When power-up, UL8813 will initially provide a fixed 31.25% duty PWM pulse on Gate
output Pin. Then the PWM duty will start grow up when phase rotation frequency is larger
than f2.and stop until Vset is reach. The PWM growing rate is the same as LRC.
Load Response Control (LRC)
The engine speed is sensitive to the increase in alternator’s loading. The torque applied to
the engine by the alternator is proportional to the alternator’s output current. When the
load increases, the belt is stressed and the engine can stall. The LRC function manages
temporarily this important variation of alternator output current, in order to limit the torque
variation. The time is measured at the condition that PWM duty grows from 0% to 100%.
Voltage Sensing
The alternator output voltage is sensed by the Remote Sense Pin (Pin 4) and Local Sense (Pin
3). The regulated system voltage (Vset) is determined by the voltage divider resistor values.
Normally the remote sense Pin determines the value at which the battery voltage is
regulated. When the voltage of the remote Pin is too low, a sense loss function allows the
local sense Pin to substitute remote Pin to determine the regulated battery voltage. In some
application the remote Pin is not used, and remote Pin must be connected to local Pin
Phase Input
The phase input signal is normally coming from one corner of the alternator's stator to
provide an ac voltage for rotation detection. If the frequency of this signal is less than the
phase rotation detection frequency (f2), the fault lamp base (Pin 8) will output high to drive
the warning lamp and the Gate (Pin 1) output duty cycle is restricted to approximately
31.25% maximum
Fault Lamp Warning
Lamp Base pin (Pin 8) is used to control the external MOSFET to drive the fault indicator
lamp. The fault lamp is energized during any of the following fault conditions:
No phase input on pin 6 due to slow or no alternator rotation
Phase input voltage on pin 6 is less than the phase detection threshold
Over-voltage on Pin 3
Under-voltage on Pin 3 with the phase input frequency being higher than the f3 frequency.
Under-voltage, Over-voltage and Load Dump
During an under-voltage condition, the fault lamp will turn on only if the phase buffer input
signal frequency is higher than the Low/High RPM transition frequency (f3). This is to ensure
that the under-voltage condition is caused by a true fault and not just by low alternator
rotation. To help maintain system voltage regulation during an under-voltage condition, the
output duty cycle is automatically increased to 100%.During an over-voltage condition, the
fault lamp will be turned on and the Gate (Pin 1) output duty cycle is restricted to
approximately 3.1% maximum. The threshold value of over-voltage detect fixed to 1.18*Vsv.
If the load dump detect threshold is exceeded, the fault lamp and the PWM outputs are
disabled to protect the driver, field winding and lamp
Field coil Device Protection
For low side application, When the external MOSFET fails to decrease the source voltage
less than field short voltage threshold (VThfsc<Vsource), A short circuit signal is send to turn
OFF the GATE, A short circuit signal is send. The short circuit control logic check the source
voltage every 30ms (130Hz). If the field short circuit is eliminated, the GATE output will back
to normal state. The Field short polling duty cycle is about 0.4%, (or about a 30.7us ON
pulse) at a frequency of 130Hz
Package: SOP-10
|
Regulator |
Lester |
Rectifier |
|
调节器 |
电机号码 |
桥的编号 |
|
IN437 |
13409 |
INR720 |
|
INR720HD |
||
|
13486 |
INR720HD |
|
|
INR720 |
||
|
INR402 |
||
|
13487 |
INR402 |
|
|
13489 |
INR402 |
|
|
13512 |
INR720HD |
|
|
INR720 |
||
|
13536 |
INR720HD |
|
|
INR720 |
||
|
13673 |
INR720 |
|
|
INR502 |
||
|
INR720HD |
||
|
23273 |
INR733 |
|
|
|
|
|
|
IN6343 |
11204 |
INR434 |
|
11290 |
INR435 |
|
|
11291 |
INR424 |
|
|
11431 |
INR427 |
|
|
11432 |
INR434 |
|
|
23821 |
INR437 |
|
|
23839 |
INR431 |
|
|
|
|
|
|
IN6302 |
11201 |
INR422 |
|
11323 |
INR427 |
|
|
20226 |
INR422 |
|
|
23947 |
INR427 |
