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參數(shù)資料
| 型號： | P82CF201BDH |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Low power, low price dual fan manager |
| 中文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO20 |
| 封裝： | 4.40 MM, PLASTIC, MO-153, SOT-360-1, TSSOP-20 |
| 文件頁數(shù)： | 3/11頁 |
| 文件大小： | 83K |
| 代理商： | P82CF201BDH |
Philips Semiconductors
Product data
P82CF201
Low power, low price dual fan manager
2002 Nov 18
3
su01717
RC CONTROL
RESISTANCE
MEASUREMENT
FAULT
DETECTION
WATCHDOG
RESET
PWM 1 & 2
R
refC
DRIVE
R
thermC
DRIVE
FAULT
V
SENSE2
V
SENSE1
FAN1DRIVE
FAN2DRIVE
R
refC
R
thermC
Figure 1. Functional Block Diagram.
FUNCTIONAL DESCRIPTION
PWM Description
The PWM controls the fan speed by comparing the thermistor
resistance to a reference resistance. This ratio translates into the
duty cycle of the PWM.
The PWM controls the fan speed proportionally to the thermistor
resistance. The 30Hz PWM duty cycle has resistance control range
from 10K to 1.75 K
(typical for NTC thermistor) for 30% to 98%
output duty cycle. The PWM pins drive a low cost PNP transistor to
give a good drive into the N-channel MOSFET as the low side
power switch element in the system. Example of drive circuits will be
shown Figure 4. This output has asymmetric complementary drive.
Since the system relies on PWM rather than linear power control,
the dissipation in the power switch is kept to a minimum. Generally,
very small devices (TO-92 or SOT package) will suffice.
500 mS Delay Turn-On Description
When temperatures rise above 25
°
C and THRESHOLD is tied to
GND (NTC thermistor at 10K or less) for both fans, there is a turn-on
delay of 500 mS for the second fan. This reduces the inrush current
and suppresses acoustic noise.
Thermistor Measurement Description
A resistor can be measured using a comparator, which compares
unknown resistor value. Since the same capacitor and internal
voltage reference are used throughout, it results in a simple
calculation.
R
unknown
=
((RunknownChargingTime*Rreference)/RreferenceChargingTime)
The RC circuits are charged in sequence, until they reach an
internal voltage reference of 1.23 V.
The RC charging time is measured in the 256uSec - 65535uSec.
This range is divided up in 256 time increments. Values of R and C
have to be chosen so that it will be within that window.
The RC charging time of the reference resistor and thermistor are
measured. The thermistor value is calculated by comparing the RC
time of the Reference resistor and RC time of the thermistor.
R
thermistor
= ((RthermistorCTime*Rreference)/RreferenceCTime)
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