参数资料
型号: IR3093MTRPBF
厂商: International Rectifier
文件页数: 29/39页
文件大小: 0K
描述: IC CTLR 3PHASE VR10 48-MLQP
标准包装: 3,000
应用: VID 电压编程器
电源电压: 7.4 V ~ 21 V
电流 - 电源: 38mA
工作温度: 0°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 48-MLPQ
供应商设备封装: 48-MLPQ(7x7)
包装: 带卷 (TR)
IR3093PbF
The power good delay time is
t VccPG
C SS * ' V
I CHG
0 .1 * 10 6 * (3 . 75   1. 33   1. 1)
60 * 10 6
2 . 2 mS
VDAC Slew Rate Programming Capacitor C DAC and Resistor R DAC
From this data sheet, the sink current I SINK of VDAC pin corresponding to R OSC =30k ? LV   X$ 
Calculate the VDAC down-slope slew-rate programming capacitor from the required down-slope slew
rate.
2 . 5   10 3 / 10
C VDAC
I SINK
SR DOWN
85   10 6
6
34 nF
Choose C VDAC = 33nF
Calculate the programming resistor.
C DAC
  33 * 10  
3 . 2 * 10
R DAC
0 . 5  
3 . 2   10 15
2
0 . 5  
15
9 2
3.4 ?
In practice slightly adjust R DAC to get desired slew rate.
Over Current Setting Resistor R OCSET
According to the spec, the output current limit set point I LIMIT = 130A. The bias current I OCSET set by
R ROSC is around 40uA. Assume the maximum temperature T L_MAX = 120 C, the room temperature
T ROOM =25 C, so
R L _ MAX
0 . 65 * 10 3   [ 1   3850 * 10 6   ( 120   25 )] 0 . 9 m :
Assume maximum IC temperature T IC_MAX= 110C, the minimum current sense amplifier gain can be
calculated from Equation (11).
G CS _ MIN
23 . 5   [ 1   1400 * 10 6   ( 110   25 )] 21
' I
L   Vin   fsw
0 . 25   10 6   12   300   10 3
Using Equation (12) and (13) to calculate R OCSET:
Vo   ( Vin   Vo ) 1 . 33   ( 12   1 . 33 )
15 . 8 A
 
[(
R OCSET
[(
I LIMIT
3
 
' I
2
)   R L _ MAX ]   G CS _ MIN / I OCSET
130 15.8
3 2
)   0 . 9   10 3 ]   21 /( 40   10 6 )
24 . 2 k :
Choose R OCSET = 25 k ?
No Load Output Voltage Setting Resistor R FB and Adaptive Voltage Positioning Resistor R DRP
The value of the internal current source current I FB in the curve is 42uA according to R ROSC = 30k ? 
Page 29 of 39
09/08/05
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