HPFANG+/-
http://www.championmicro.com.tw
HP Power Supply Fan Controller DATA SHEET
General Description:
HPFANG+/- is designed for HP related application. The
target application is for the Fan Control Section of HP PC
Power Supply. It might infringe HP patent if the application
is not relate to HP related business.
HPFANG+/- is designed to achieve high performance and
high efficiency with low cost BOM. With HPFANG+/-, the
application may reduce one FAN.
It combines PC
motherboard temperature information and the temperature
information of PC power supply. The temperature
information of PC power supply is an analog signal called
TFB, which can be generated by a simple Thermistor. The
temperature information of PC motherboard usually is
presented by the duty cycle of the signal called FANCMD.
TEAO and TFB are output and inverting input of the OP.
The non-inverting input of TEAO OP is connected to internal
2.5V reference. A simple inverting gain configuration with
a thermistor in series of a current limit resistor Rs can
program the TEAO to search for the duty cycle of
FANPWMOUT which corresponds with the fan speed at the
temperature. When TEAO is greater than 3.5V, the
FANPWMOUT duty cycle is 100%. When TEAO is ~ 2.5V,
the FANPWMOUT duty cycle is ~50%. When TEAO is
below 1.5V, the FANPWMOUT duty cycle is ~ 1.5%.
Usually, 50% duty cycle of FANPWMOUT corresponds to
50% Power Supply load at room temperature, and 5% duty
cycle of FANPWMOUT corresponds to 20% Power Supply
load at room temperature. To have FANPWMOUT ~ 50%,
TEAO is ~2.5V.
FANCMD is represented as motherboard temperature
information. FANCMD usually is a 25KHz PWMing signal.
The amplitude of FANCMD needs to be greater than 1.5V
and lower than 5V to work with HPFANG+/-.
HPFANG+/- is inverting the complimentary duty cycle of
FANCMD to FANPWMOUT. FANCMD duty cycle is ~
FANPWMOUT duty cycle.
HPFANG+/- selects the highest voltage among TEAO,
CAVERAGE to compare with oscillator ramp, which is 1.5V
to 3.5V.
HPFANG+/- design tool is available. Please contact
Champion Sales.
FEATURES
Combine Mother Board Temperature Signals with Power
Supply Temperature Signals
Low BOM and It may reduce one Fan
Precision OP (TEAO) uses TFB to sense the thermistor
information at power supply
Precision 25KHz Ramp generator: Peak ~ 3.5V (Duty
~100%) and Valley ~1.5V (Duty ~1.5%)
Precision 25KHz Ramp generator compares TEAO,
Caverage, and Fault to determine the duty cycle of
FANPWMOUT
It does not require negative voltage
Accept Pulse PWMing signal FANCMD (prefer it is
below 100Khz) from Mother Board
Precision Duty to Duty Converter or called a Pulse to
Pulse Converter or called PWMing to PWMing Converter
The amplitude of Input pulse (FANCMD), peak to peak
can be from 0V - 5V to 0V - 2V
Minimum VCC > 8V Power Supply
Preferred VCC~ 12V
Precision (1% variation) 5V Reference Voltage
Precision Internally Generated 25KHz +/-10% Switching
Frequency
FANPWMOUT 1.5% to 100% Output Duty Cycle
Thermal Shut Down can be done by sensing TFB or
TEAO
Low Operating Current, Ivcc ~ 0.5mA
HPFANG+ : Input Signal FANCMD 25% Duty (+)
Output Signal FANCMD 25% Duty (+)
HPFANG- : Input Signal FANCMD 25% Duty (-)
Output Signal FANCMD 75% Duty (-)
8 pin package : DIP & SOP Package
2013/01/17
Rev. 1.2
Champion Microelectronic Corporation
1
HPFANG+/-
http://www.championmicro.com.tw
HP Power Supply Fan Controller DATA SHEET
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these specifications apply Vcc=+12V, C
VREF
= 0.1uF, T
A
=Operating Temperature Range
(Note1)
Symbol
Parameter
Test Conditions
Min.
HPFANG+/-
Unit
Typ.
Max.
Supply
VCC
VCC
Input Voltage Range
Operating Current
12V, C
L
= 0
8
12
0.45
15
V
mA
Voltage Error Amplifier Output (TEAO)
Input Voltage Range
TFB
Feedback Reference Voltage TEAO = TFB, T
A
= 25℃,
Input Bias Current
Output High Voltage
Output Low Voltage
Output Sourcing Current
Output Sinking Current
Open Loop Gain
Note 2, Note 3
T
A
= 25℃, ITEAO
SOURCING
=1mA
T
A
= 25℃, ITEAO
SINKING
=1mA
TEAO = TFB,T
A
= 25℃, ITEAO
SOURCING
=1mA
TEAO = TFB,T
A
= 25℃, ITEAO
SINKING
=1mA
DC gain
2.475
2.475
0
2.475
-1.0
4.0
0.65
2.5
2.5
110
135
1
2.525
2.525
2.5
-0.05
3
2.525
V
V
μ
A
V
V
V
V
dB
dB
Power Supply Rejection Ratio 10V < V
CC
< 12V
FANPWMOUT Duty vs TEAO voltage
TEAO~1.5V
TEAO~2.5V
TEAO~3.5V
Reference
VREF
Output Voltage
Line Regulation
Load Regulation
Load Regulation
Temperature Stability
Total Variation
Long Term Stability
10V < V
CC
< 12V, T
A
= 25℃, TEAO=1.5V
10V < V
CC
< 12V, T
A
= 25℃, TEAO=2.5V
10V < V
CC
< 12V, T
A
= 25℃, TEAO=3.5V
1.5
50
100
5
%
%
%
T
A
= 25℃, I(VREF) = 0mA
10V < V
CC
< 12V @ T=25℃
VCC=12V, 0mA < I(VREF)< 3mA; T
A
=25℃
VCC=12V, 0mA< I(VREF)< 3mA;
T
A
=-40℃~85℃
4.95
5
10
15
30
0.4
5.05
25
V
mV
mV
50
mV
%
Line, Load, Temp
T
J
= 125℃, 1000HRs
4.95
5
5.05
25
V
mV
2013/01/17
Rev. 1.2
Champion Microelectronic Corporation
4
HPFANG+/-
http://www.championmicro.com.tw
HP Power Supply Fan Controller DATA SHEET
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these specifications apply Vcc=+12V, C
VREF
= 0.1uF, T
A
=Operating Temperature Range
(Note1)
HPFANG+/-
Symbol
Parameter
Test Conditions
Min.
FANPWMOUT Matching Test
HPFAN(+/-)
HPFAN(+/-)
HPFAN(+/-)
HPFAN(-)
HPFAN(+)
HPFAN(-)
HPFAN(+)
FANPWMOUT Duty
FANPWMOUT Duty
FANPWMOUT Duty
FANPWMOUT Duty
FANPWMOUT Duty
FANPWMOUT Duty
FANPWMOUT Duty
INPUT SIGNAL FANCMD 15KHz
50% Duty (+/-)
INPUT SIGNAL FANCMD 25KHz
50% Duty (+/-)
INPUT SIGNAL FANCMD 35KHz
50% Duty (+/-)
INPUT SIGNAL FANCMD 25KHz
25% Duty (-)
INPUT SIGNAL FANCMD 25KHz
25% Duty (+)
INPUT SIGNAL FANCMD 25KHz
75% Duty (-)
INPUT SIGNAL FANCMD 25KHz
75% Duty (+)
45
45
45
70
20
20
70
50
50
50
75
25
25
75
55
55
55
80
30
30
80
%
%
%
%
%
%
%
Typ.
Max.
Unit
Internal Oscillator (Measuring FANPWMOUT)
Frequency
T
A
= 25℃
22.5
25
2
3.5
1.5
2
2
VCC=10V~12V, 0mA <I(VREF)< 3mA;
T
A
= -40℃~85℃
22.5
1.2
1.5
27.5
1.8
27.5
kHz
V
V
V
%
%
kHz
us
Ramp Peak to Peak Voltage 10V < V
CC
< 12V
Ramp Peak High Voltage
Ramp Peak Low Voltage
Voltage Stability
Temperature Stability
Total Variation
FANPWMOUT Dead Time
FANCMD / FANPWMOUT
FANCMD Threshold Voltage TFB=2.6V,
FANCMD>1.5V Minimum Duty Cycle
FANCMD<1.5V Maximum Duty Cycle
Output Low Rdson
Rise/Fall Time (Note 3)
Output High Voltage
TFB>2.5V and FANCMD>1.5V
(For HPFAN-),
TFB<2.5V and FANCMD<1.5V
(For HPFAN-),,
I
OUT
= -5mA @ T
A
=25℃ Vcc=12V
C
L
= 100pF @ T
A
=25℃
T
A
= 25℃, IFANPWMOUT
SOURCING
=5mA
4.5
1.48
10V < V
CC
< 12V
10V < V
CC
< 12V
10V < V
CC
< 12V
1.5
1.5
100
80
50
1.55
V
%
%
ohm
ns
5
V
Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst-case test conditions.
Note 2: Includes all bias currents to other circuits connected to the V
FB
pin.
Note 3: Guaranteed by design, not 100% production test.
2013/01/17
Rev. 1.2
Champion Microelectronic Corporation
5
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