FDMF6840C View Datasheet(PDF) - Fairchild Semiconductor
Part Name
Description
MFG CO.
'FDMF6840C' PDF : 19 Pages View PDF
Typical Performance Characteristics
Test Conditions: VIN=12 V, VOUT=1 V, VCIN=5 V, VDRV=5 V, LOUT=250 nH, TA=25°C, and natural convection cooling,
unless otherwise specified.
1.01
VIN = 12V, VDRV & VCIN = 5V, FSW = 300kHz, VOUT = 1V, IOUT = 30A
1.00
45
VIN = 12V, VDRV & VCIN = 5V, VOUT = 1V, IOUT = 0A
40
35
0.99
30
25
0.98
20
15
0.97
10
0.96
200
250
300
350
400
450
500
Output Inductor, LOUT (nH)
5
100 200 300 400 500 600 700 800 900 1000 1100
Module Switching Frequency, FSW (kHz)
Figure 12. Power Loss vs. Output Inductor
Figure 13. Driver Supply Current vs. Switching
Frequency
17
VIN = 12V, VOUT = 1V, FSW = 300kHz, IOUT = 0A
16
1.04
1.03
VIN = 12V, VDRV & VCIN = 5V, VOUT = 1V
15
1.02
14
FSW = 300kHz
1.01
13
1.00
12
FSW = 1000kHz
11
0.99
10
4.0
4.5
5.0
5.5
6.0
Driver Supply Voltage, VDRV & VCIN (V)
Figure 14. Driver Supply Current vs. Driver Supply
Voltage
3.2
UVLOUP
3.1
0.98
0
5 10 15 20 25 30 35 40 45
Module Output Current, IOUT (A)
Figure 15. Driver Supply Current vs. Output
Current
3.0
TA = 25°C
2.5
VIH_PWM
3.0
2.9
2.8
2.7
UVLODN
2.6
-55
0
25
55
100 125 150
Driver IC Junction Temperature, TJ (oC)
Figure 16. UVLO Threshold vs. Temperature
2.0
VTRI_HI
VHIZ_PWM
1.5
1.0
0.5
4.50
VTRI_LO
VIL_PWM
4.75
5.00
5.25
Driver IC Supply Voltage, VCIN (V)
5.50
Figure 17. PWM Threshold vs. Driver Supply Voltage
© 2015 Fairchild Semiconductor Corporation
FDMF6840C • Rev. 1.0
9
www.fairchildsemi.com
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