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PDF NCT3940S-A Data sheet ( Hoja de datos )
| Número de pieza | NCT3940S-A | |
| Descripción | 1.6 Times Linear Fan Driver | |
| Fabricantes | novoTon | |
| Logotipo |  |
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Nuvoton
1.6 Times Linear Fan Driver
NCT3940S/ NCT3940S-A
1 page  
NCT3940S/ NCT3940S-A
VCC
CIN
4.7uF
DC Voltage
VIN EN/ FON#
EN/ Full on Mode
VSET
VOUT
GND
COUT
4.7uF
FAN
Typical Application Circuits
5. PIN DESCRIPTION
PIN NAME
NO
NCT3940S NCT3940S-A
FON#
N/A
1
EN
VIN
VOUT
VSET
1 N/A
2
3
4
PIN TYPE
I
I
POWER
AO
AIN
DESCRIPTION
Only for NCT3940S-A device.
Full On mode selection pin. Output voltage
follows 1.6 times of VSET pin voltage when
FON# pin at high level. The internal power
MOSFET full turns on when FON# pin at low
level. Internal pull up resistor connected to
VIN.
Only for NCT3940S device.
Enable pin. Output voltage follows 1.6 times
of VSET pin voltage when Enable pin at high
level.
DC power supply input. Connect a bypass
capacitor (4.7uF, typically) is recommended.
Voltage output pin. Connect a low ESR
ceramic capacitor (4.7uF, typically) to ground
to assure stability.
Output voltage setting pin. The inputs could
be DC voltage. The input voltage must be
larger that 1V.
Publication Date: Mar., 2011
-3- Revision A3
5 Page 
NCT3940S/ NCT3940S-A
450
400
350
300
250
200
150
100
50
0
0
Input voltage VS. Quiescent current
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input voltage (V)
Figure 07. Input Voltage vs. Quiescent Current
VSET VS. Quiescent current
700
600
TA = -40℃
500
400 TA = 25℃
300
200
TA = 85℃
100
0
0 0.5 1.0 1.5 2.0
VSET (V)
Figure 08. VSET vs. Quiescent Current
2.5
3.0
VSET VS. VOUT
6
5
4
3
2
1
0
0.05 0.55 1.05 1.55 2.05 2.55 3.05
VSET (V)
Figure 09. VSET vs. VOUT
EN & FON threshold VS. Temp.
1.60
Rising
1.20
0.80
Falling
0.40
0.00
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 85
Temp
Figure 10. EN & FON Threshold vs. Temperature
Dropout VS. Temp.
180
160
140 IOUT = 500mA
120
100
80 IOUT = 300mA
60
40
20 IOUT = 100mA
0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 85
Temp.
Figure 11. Dropout Voltage vs. Temperature
Publication Date: Mar., 2011
-9- Revision A3
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet NCT3940S-A.PDF ] | |
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