参数资料
型号: IR3502MTRPBF
厂商: International Rectifier
文件页数: 28/39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
R t _ room = ?
K c _ room
? 1 ? ? RTCMP 3
R t _ t max = ?
K c _ t max
? 1 ? ? RTCMP 3
? 3 ? K THERM _ room
?
?
? 3 ? K THERM _ room
?
?
?
?
?
?
?
?
(17)
(18)
?
RTHERM t max = RTHERM room ? e
? 1 1
β THERM ? ? ?
? 273 + T max 273 + T room
?
?
?
(19)
B TH = RTHERM
room
+ RTHERM
t max
(20)
? ?
? ?
C TH = RTHERM room ? RTHERM t max
?
?
? RTHERM room ? RTHERM t max
1 1
?
? R t _ t max R t _ room
?
?
?
?
? ?
?
(21)
RTCMP 1 =
? B TH +
( B TH ) 2 ? 4 ? C TH
2
(22)
?
?
?
?
RTCMP 2 =
?
? R t _ t max
1
?
1
1
R t _ t max + RTCMP 1 ? ?
(23)
Droop Resistor
The inductor DC resistance is utilized to sense the inductor current. The copper wire of inductor has a constant
temperature coefficient of 3850 ppm/°C, and therefore the maximum inductor DCR can be calculated from (15),
where R L_tmax and R L_room are the inductor DCR at maximum temperature T max and room temperature T room .
respectively. After the thermal compensation is achieved using the procedure given above, the droop resistance
can be calculated using the following equation.
1 R FB
? ? ?
R DRP =
3 R o
?
? G CS ? R L _ ROOM
? n
? ?
? ? ? ? 1 +
? ?
R t _ room ?
?
RTCMP 3 ?
(24)
Over-current Threshold
Once the current report gain and the thermal compensation are calculated the OCP threshold is calculated using the
following expression.
? ?
? ? ? 1 +
?
?
I OCP =
1 ? R L _ room ? G cs
?
3 ? n
? ?
?
? ?
1 . 17
( RTCMP 2) II ( RTCMP 1 + RTHERM _ room ) ?
RTCMP 3
(25)
No Load Output Voltage Setting Resistor R VSETPT ,
A resistor between VSETPT pin and VDAC is used to create output voltage offset V O_NLOFST, which is the
difference between V DAC voltage and output voltage at no load condition. R VSETPT is determined by (26), where
I VSETPT is the current flowing out of VSETPT pin as shown in Figure 19.
Page 28 of 39
R VSETPT =
V O _ NLOFST
I VSETPT
July 28, 2009
(26)
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