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参数资料
| 型号： | IRDC3870 |
| 厂商： | International Rectifier |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL REG SUPIRBUCK DC/DC |
| 产品变化通告： | (EP) Parts Discontinuation 25/May/2012 |
| 标准包装： | 1 |
| 系列： | * |
IR3870MPBF
TYPICAL OPERATING DATA (25 o C)
(Circuit of Figure 15, VCC = 3.3V, V5 = 5V, V IN = 12.6V, F = 500kHz Unless otherwise noted)
1000000
336
1000
334
Rff ( 0.5 ? fsw )
Rff ( 1 ? fsw )
Rff ( 1.5 ? fsw )
Rff ( 2 ? fsw )
332
330
Rff ( 2.5 ? fsw )
Rff ( 3 ? fsw )
Rff ( 3.5 ? fsw )
Rff ( 4 ? fsw )
Rff ( 4.5 ? fsw )
V OUT = 5V
328
326
Rff ( 5 ? fsw )
324
0
000000 V OUT
200000
200
= 0.5V
fsw
Switching Frequency
Switching Frequency (KHz)
1000000
1000
322
0
25
50 75
Temperature (C)
100
125
Figure 1. Feedforward Resistance Vs Switching
Frequency: 0.5V V OUT step
Figure 3. On-Time Variation in DCM:
V IN = 12V, V OUT =1.1V, RFF = 180kOhm
500
450
400
350
300
250
200
150
100
50
315
314.5
314
313.5
313
312.5
312
311.5
0
0
2
4
6
8
10
12
311
0
25
50
75
100
125
Output Current (A)
Temperature (C)
Figure 2. Switching Frequency Vs Output Current
Figure 4. On-Time Variation in CCM:
V IN = 12V, V OUT =1.1V, RFF = 180kOhm
7
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