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| 型号： | IR3500MTRPBF |
| 厂商： | International Rectifier |
| 文件页数： | 31/47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 |
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IR3500
The soft start delay time (TD1) and VR ready delay time (TD3) are determined by (8) to (9) respectively.
TD 1 =
C SS / DEL * 1 .4
I CHG
=
C SS / DEL * 1. 4
52 . 5 * 10 ? 6
(8)
TD 3 =
C SS / DEL * ( 4. 0 ? V O )
I CHG
=
C SS / DEL * ( 4. 0 ? V O )
52 . 5 * 10 ? 6
(9)
Once C SS/DEL is chosen, the minimum over-current fault latch delay time t OCDEL is fixed and can be quantified as
t OCDEL =
C SS / DEL * 0 .12
I DISCHG
=
C SS / DEL * 0. 12
55 * 10 ? 6
(10)
VDAC Slew Rate Programming Capacitor C VDAC and Resistor R VDAC
The slew rate of VDAC down-slope SR DOWN can be programmed by the external capacitor C VDAC as defined in
(11), where I SINK is the sink current of VDAC pin. The slew rate of VDAC up-slope is the same as that of down-
slope. The resistor R VDAC is used to compensate VDAC circuit and can be calculated as follows
C VDAC =
I SINK
SR DOWN
=
44 * 10 ? 6
SR DOWN
(11)
R VDAC = 0 . 5 +
3 . 2 ? 10 ? 15
C VDAC 2
(12)
Over Current Setting Resistor R OCSET
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 (13),
where R L_MAX and R L_ROOM are the inductor DCR at maximum temperature T L_MAX and room temperature
T_ ROOM respectively.
R L _ MAX = R L _ ROOM ? [ 1 + 3850 * 10 ? 6 ? ( T L _ MAX ? T ROOM )]
(13)
The total input offset voltage (V CS_TOFST ) of current sense amplifier in phase ICs is the sum of input offset
(V CS_OFST) of the amplifier itself and that created by the amplifier input bias current flowing through the current
sense resistor R CS .
V CS _ TOFST = V CS _ OFST + I CSIN + ? R CS
(14)
The over-current limit is set by the external resistor R OCSET and is given by (15). In a multiphase architecture the
peak to peak ripple of the net inductor current is much smaller than the stand alone phase due to interleaving.
The ratio of the peak to average current in this case can be approximated using (16).
R OCSET = [
I LIMIT
n
? R L _ MAX ? ( 1 + K P ) + V CS _ TOFST ] ? G CS / I OCSET
(15)
? V I ? D ? ( 1 ? D ) ? n ? ( D ? n ) ? ( n
K P = ?
? D ) ?
? m m + 1 ?
( I LIMIT / n ) ? L ? f sw ? 2 ? D ? ( 1 ? D )
?
(16)
Where; I LIMIT =Over current limit, n=Number of phases, K P =Ratio of the peak to average current for the inductor,
G CS =Gain of the current sense amplifier, I OCSET = Determined by the ROSC and given by Figure 24,
D=Vo/V I , m=Maximum integer that doesn’t exceed (n*D)
Page 31 of 47
May 18, 2009
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相关代理商/技术参数 |
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|---|---|
| IR3500V | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMPBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM VR11.1 CPU VTT CONTROL IC |
| IR3500VMTRPBF | 功能描述:开关变换器、稳压器与控制器 X-PHASE IR3500V AMD SVID CTRL IC RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| IR3502 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
| IR3502_09 | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE3TM CONTROL IC |
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