参数资料
型号: IR3503MTRPBF
厂商: International Rectifier
文件页数: 33/39页
文件大小: 0K
描述: IC CTRL XPHASE VR11.0/1 32-MLPQ
标准包装: 1
系列: XPhase3™
应用: 处理器
电流 - 电源: 8mA
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
其它名称: IR3503MTRPBFDKR
IR3503
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 VRRDY 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
10 * 10 ? 3 / 10 ? 6
= 4 . 4 nF
A 3.3 nF capacitor can be used. A series resistor is used to stabilize the VDAC buffer.
R VDAC =
1
2 ? π ? 900 kHz ? C VDAC
= 53 ? . A 50
resistor is selected.
No Load Output Voltage Setting Resistor R VSETPT
The bias current of VSETPT pin is 19.9 μ A with R OSC = 30.1 k .
R VSETPT =
V O _ NLOFST
I VSETPT
=
10 * 10 ? 3
19 . 9 * 10 ? 6
= 499 ?
Current Report Gain and Thermal Compensation
The reporting gain specifies the maximum load current in the form of a voltage. For this example, the 180 A current
represents 0.95 V at IMON. If the thermal effects are neglected (14) can be used to find the reporting gain. However,
as the inductor DCR increases with temperature, the thermal compensation string (RTCMP1, RTCMP2, and
RTHERM) can be used to compensate this change in DCR.
Assuming T room =25 oC, T max =100 oC the change in DCR can be found using (15)
R L _ MAX = 0 . 29 m ? [ 1 + 3850 * 10 ? 6 ? ( 100 ? 25 )] = 0 . 374 m ?
Pre-select RTCMP3 =1 k , and R THERM_room =10 k
using (16)-(23)
RTCMP1 = 9.411 k
RTCMP2 = 9.24 k
Page 33 of 39
with β THERM = 3380K. RTCMP1 and RTCMP2 can be found out
February 12, 2010
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