参数资料
型号: IR3500MTRPBF
厂商: International Rectifier
文件页数: 39/47页
文件大小: 0K
描述: IC XPHASE3 CONTROLLER 32-MLPQ
产品变化通告: (EP) Parts Discontinuation 25/May/2012
标准包装: 1
系列: XPhase3™
应用: 处理器
电流 - 电源: 6.5mA
电源电压: 4.75 V ~ 7.5 V
工作温度: 0°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘
供应商设备封装: 32-MLPQ(5x5)
包装: 标准包装
产品目录页面: 1383 (CN2011-ZH PDF)
其它名称: IR3500MTRPBFDKR
IR3500
The soft start time is
TD 2 =
C SS / DEL * 1.1
I CHG
=
0. 1 * 10 ? 6 * 1.1
52 . 5 * 10 ? 6
= 2 . 1 mS
The VID sample delay time is
TD 3 =
C SS / DEL * (3. 2 ? 1 .4 ? 1. 1)
I CHG
=
0. 1 *10 ? 6 * 0. 7
52 . 5 * 10 ? 6
= 1 . 33 mS
VID rise time is
TD 4 =
C SS / DEL * V DAC ? 1 .1
I CHG
=
0 .1 * 10 ? 6 * 1 . 3 ? 1 .1
52 . 5 * 10 ? 6
= 0 . 38 mS
The VR ready delay time is
TD 5 =
C SS / DEL * ( 3. 92 ? 3)
I CHG
? TD 4 =
0. 1 * 10 ? 6 * 0. 92
52 . 5 * 10 ? 6
? TD 4 = 1 . 37 mS
Minimum over current fault latch delay time is
t OCDEL =
C SS / DEL * 0 .12
I OCDISCHG
=
0. 1 * 10 ? 6 * 0. 12
55 * 10 ? 6
= 0 . 21 ms
VDAC Slew Rate Programming Capacitor C VDAC and Resistor R VDAC
Calculate the VDAC down-slope slew-rate programming capacitor from the required down-slope slew rate. The
up-slope slew rate is the same as the down-slope slew rate.
C VDAC =
I SINK
SR DOWN
=
44 * 10 ? 6
2 . 5 * 10 ? 3 / 10 ? 6
= 18 nF
Calculate the programming resistor.
R VDAC = 0 . 5 +
3 . 2 * 10 ? 15
C VDAC 2
= 0 . 5 +
3 . 2 * 10 ? 15
( 18 * 10 ? 9 ) 2
= 10 ?
Over Current Setting Resistor R OCSET
The room temperature is 25oC and the target PCB temperature is 100 oC. The phase IC die temperature is about
1 oC higher than that of phase IC, and the inductor temperature is close to PCB temperature.
Calculate Inductor DC resistance at 100 oC,
R L _ MAX = R L _ ROOM ? [ 1 + 3850 * 10 ? 6 ? ( T L _ MAX ? T ROOM )] = 0 . 5 * 10 ? 3 ? [ 1 + 3850 * 10 ? 6 ? ( 100 ? 25 )] = 0 . 64 m ?
Set the over current limit at 135A. From Figure 22, the bias current of OCSET pin (I OCSET ) is 40uA with
R OSC =15k . The total current sense amplifier input offset voltage is 0.3mV, which includes the offset created by
the current sense amplifier (CSA) input bias current through the resistor R CS .
V CS _ TOFST = 0 . 3 mV
Page 39 of 47
May 18, 2009
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