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参数资料
| 型号： | IR3080MTR |
| 厂商： | International Rectifier |
| 文件页数： | 21/41页 |
| 文件大小： | 0K |
| 描述： | IC PHASE CONTROLLER 32L MLPQ |
| 标准包装： | 3,000 |
| 系列： | XPhase™ |
| 应用： | 处理器 |
| 电流 - 电源： | 11mA |
| 电源电压： | 9.5 V ~ 14 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： | 带卷 (TR) |
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IR3080
t SSDEL =
C SS / DEL * ( 1 . 3 ? R SS / DEL * I CHG )
I CHG
=
C SS / DEL * ( 1 . 3 ? R SS / DEL ? 70 * 10 ? 6 )
70 * 10 ? 6
( 7)
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
Equation (8), where I SINK is the sink current of VDAC pin as shown in Figure 15. The resistor R VDAC is used to
compensate VDAC circuit and is determined by Equation (9). The slew rate of VDAC up-slope SR UP is proportional
to that of VDAC down-slope and is given by Equation (10), where I SOURCE is the source current of VDAC pin as
shown in Figure15.
C VDAC =
I SINK
SR DOWN
(8)
R VDAC = 0 . 5 +
3 . 2 ? 10 ? 15
C VDAC 2
(9)
SR UP =
I SOURCE
C VDAC
(10)
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 Equation
(11), 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 )]
(11)
The current sense amplifier gain of IR3086 decreases with temperature at the rate of 1470 ppm/°C, which
compensates part of the inductor DCR increase. The phase IC die temperature is only a couple of degrees Celsius
higher than the PCB temperature due to the low thermal impedance of MLPQ package. The minimum current sense
amplifier gain at the maximum phase IC temperature T IC_MAX is calculated from Equation (12).
G CS _ MIN = G CS _ ROOM ? [ 1 ? 1470 * 10 ? 6 ? ( T IC _ MAX ? T ROOM )]
(12)
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 currents flowing through the current
sense resistors R CS+ and R CS- .
V CS _ TOFST = V CS _ OFST + I CSIN + ? R CS + ? I CSIN ? ? R CS ?
(13)
The over current limit is set by the external resistor R OCSET as defined in Equation (14), where I LIMIT is the required
over current limit. I OCSET, the bias current of OCSET pin, changes with switching frequency setting resistor R OSC
and is determined by the curve in Figure 14. K P is the ratio of inductor peak current over average current in each
phase and is calculated from Equation (15).
R OCSET = [
I LIMIT
n
? R L _ MAX ? ( 1 + K P ) + V CS _ TOFST ] G CS _ MIN / I OCSET
(14)
Page 21 of 41
K P =
( V I ? V O ) ? V O /( L ? V I ? f SW ? 2)
I O / n
(15)
9 /30/04
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|---|---|
| IR3080MTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE VRD10 CTRL IC CTRL IC 200 to 700mV 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 |
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| IR3081A | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VR 10 CONTROL IC |
| IR3081AM | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM VR 10 CONTROL IC |
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