参数资料
型号: IR3502MTRPBF
厂商: International Rectifier
文件页数: 31/39页
文件大小: 0K
描述: IC XPHASE3 CONTROLLER 32-MLPQ
标准包装: 1
系列: XPhase3™
应用: 处理器
电流 - 电源: 8mA
电源电压: 8 V ~ 16 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: IR3502MTRPBFDKR
IR3502
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
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
From Figure 19, the bias current of VSETPT pin is 30 uA with R OSC =17.4 k .
R VSETPT =
V O _ NLOFST
I VSETPT
=
10 * 10 ? 3
30 * 10 ? 6
= 330 ?
Current Report Gain and Thermal Compensation
The reporting gain specifies the max load current in form of a voltage. For this example, the 140 A 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 Deg, T max =100 Deg the change in DCR is found our using (15)
R L _ MAX = 0 . 35 m ? [ 1 + 3850 * 10 ? 6 ? ( 100 ? 25 )] = 0 . 45 m ?
Preselect RTCMP3=1 k , and R THERM_room =10 k
(16)-(23)
RTCMP1=8.837 k
RTCMP2=8.457 k
Page 31 of 39
with β THERM =3380K RTCMP1 and RTCMP2 can be found out using
July 28, 2009
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