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PDF GR8030 Data sheet ( Hoja de datos )
| Número de pieza | GR8030 | |
| Descripción | Linear Fan Speed Controller | |
| Fabricantes | grenergy | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de GR8030 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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GR8030
Linear Fan Speed Controller with OTP Function
Features
Linear fan speed controller
Wide fan speed control range
Programmable anti-lock start up timer
Programmable minimum fan speed
Adjustable fan speed curve slope
Programmable knee point and OTP point
OTP protection with fault output
NTC thermistor open full speed operation
SOT-26 package
Applications
LCD TV power supply
Game machine power supply
Industrial or medical power supply
PC power supply
Server power supply
Description
The GR8030 is designed for programming the curve
of DC fan speed versus temperature via a NTC
thermistor and few counts of passive components.
The speed curve includes anti-lock with full speed
operation time, minimum fan speed when at idle
state, a knee point where fan speed starts to
accelerate when temperature over the set point, a
programmable slope of fan speed versus
temperature, and OTP (over-temperature protection)
trig point. The GR8030 sends a low level on FSC pin
when the OTP pin is lower than the set point of
temperature protection level. It is also built-in the
NTC thermister open with full speed operation
function.
Ordering and Marking Information
SOT-26
Code 1 8 9 A B
GH I J
Year 2008 2009 2010 2011
2016 2017 2018 2019
Code 2 1 2 3 4 ● ● ● 9 A B C
Month Jan. Feb. Mar. Apr.
Sep. Oct. Nov. Dec.
Grenergy OPTO Inc. reserves the right to make changes to improve reliability or manufacture ability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
2011.06 Ver.1.0 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
1
1 page  
Application Information
Minimum Fan Speed
The FSC pin is used to set the minimum output
voltage of DRV pin (set the idle speed of fan). The
level is decided by a voltage divider.
VFSC
=
R3
R2 + R3
VCC
Knee Point
The DC fan begins to speed up at a specific
temperature named knee point. The knee point can
be changed by the resistors R5 and R6 in series
with the NTC. R5 and R6 can be decided by below
formula.
R
5
+
R
6
=
VCC
−
V
FSC
V
×
R
NTC
(T
_
KNEE)
FSC
Where RNTC (T_KNEE) is the resistance at knee
point you set. A user can find the value from
thermistor datasheet.
The Slope of Speed V.S. Temperature
By adjusting R4, the IC can provide different slope of
the fan speed versus temperature curve. RNTC is an
approximated value during the slope range.
GR8030
could be changed with different time constant
τ =C1*(R2//R3). The period of time is about 1.5 τ for
12V supply voltage and 2τ for 17V supply voltage.
Over-temperature Protection
When the voltage of OTP pin is lower than the Vref,
the DRV pin will output 12V to drive fan as
maximum fan speed and the FSC pin will be pulled
to low. Where Vref = VCC*KOTPIN. Once the NTC
thermister is opened in accidently, the DRV pin also
outputs the high to fully drive the fan. In such
situation, the voltage on OTP pin will higher enough
to trig the NTC open comparator trip point 10.9V in
minimum. The designer should take care the R5, R6
and NTC thermister value at lower temperature.
While at lower temperature, the OTP pin may be
higher than NTC open trip point. The designer
should be sure the voltage on OTP pin is lower than
10.9V at lower temperature. Or the designer does
not need the NTC open protection function, that
could parallel one 8~9V Zener diode on OTP pin to
disable the function as shown in below figure.
.
Maximum Fan Speed
The DRV pin will pull high to 12V for maximum fan
speed in 12V system. However, in 17V system, the
DRV pin will be clamped at 14V for maximum fan
speed limitation and protect fan from damaged.
Anti-lock Start Up Timer
At start-up period, the DRV pin will output 12V. It
drives the fan with maximum speed for a set period
of time then drops to minimum voltage. The period
2011.06 Ver.1.0 Copyright Grenergy OPTO, Inc. www.grenergy-ic.com
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet GR8030.PDF ] | |
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