参数资料
型号: IR3086M
厂商: International Rectifier
文件页数: 26/34页
文件大小: 0K
描述: IC PHASE CONTROLLER 20-MLPQ
标准包装: 5
系列: XPhase™
应用: 处理器
电流 - 电源: 10mA
电源电压: 8.4 V ~ 14 V
工作温度: 0°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 20-MLPQ
供应商设备封装: 20-MLPQ(4x4)
包装: 剪切带 (CT)
其它名称: *IR3086M
IR3086
VDAC Slew Rate Programming Capacitor C VDAC and Resistor R VDAC
From Figure 15 of IR3081 Data Sheet, the sink current of VDAC pin corresponding to 800kHz (R OSC =13.3k ? ) is
170uA. Calculate the VDAC down-slope slew-rate programming capacitor from the required down-slope slew rate.
C VDAC =
I SINK
SR DOWN
=
170 * 10 ? 6
2 . 5 * 10 ? 3 / 10 ? 6
= 68 nF
Calculate the programming resistor.
R VDAC = 0 . 5 +
3 . 2 * 10 ? 15
C VDAC 2
= 0 . 5 +
3 . 2 * 10 ? 15
( 68 * 10 ? 9 ) 2
= 1 . 2 ?
From Figure 15 of IR3081 Data Sheet, the source current of VDAC pin is 250uA. The VDAC up-slope slew rate is
SR UP =
I SOURCE
C VDAC
=
250 * 10 ? 6
68 * 10 ? 9
= 3 . 7 mV / uS
Over Current Setting Resistor R OCSET
The room temperature is 25oC and the target PCB temperature is 100 oC. The phase IC die temperature is about 1
oC higher than that of phase IC, and the inductor temperature is close to PCB temperature.
Calculate Inductor DC resistance at 100 oC,
R L _ MAX = R L _ ROOM ? [ 1 + 3850 * 10 ? 6 ? ( T L _ MAX ? T ROOM )] = 0 . 5 * 10 ? 3 ? [ 1 + 3850 * 10 ? 6 ? ( 100 ? 25 )] = 0 . 64 m ?
The current sense amplifier gain is 34 at 25oC, and its gain at 101oC is calculated as,
G CS _ MIN = G CS _ ROOM ? [ 1 ? 1470 * 10 ? 6 ? ( T IC _ MAX ? T ROOM )] = 34 ? [ 1 ? 1470 * 10 ? 6 ? ( 101 ? 25 )] = 30 . 2
Set the over current limit at 135A. From Figure 14 of IR3081 Data Sheet, the bias current of OCSET pin (I OCSET ) is
90uA with R OSC =13.3k ? . The total current sense amplifier input offset voltage is 0.55mV, which includes the offset
created by the current sense amplifier input resistor mismatch.
Calculate constant K P, the ratio of inductor peak current over average current in each phase,
K P =
( V I ? V O ) ? V O /( L ? V I ? f SW ? 2 )
I LIMIT / n
=
( 12 ? 1 . 28 ) ? 1 . 28 /( 100 * 10 ? 9 ? 12 ? 800 * 10 3 ? 2 )
135 / 6
= 0 . 32
R OCSET = [
R LIMIT
n
? R L _ MAX ? ( 1 + K P ) + V CS _ TOFST ] ? G CS _ MIN / I OCSET
= (
135
6
? 0 . 64 * 10 ? 3 ? 1 . 32 + 0 . 55 * 10 ? 3 ) * 30 . 2 /( 90 * 10 ? 6 ) = 6 . 34 k ?
No Load Output Voltage Setting Resistor R FB and Adaptive Voltage Positioning Resistor R DRP
From Figure 14 of IR3081 Data Sheet, the bias current of FB pin is 90uA with R OSC =13.3k ? .
R FB =
R L _ MAX ? V O _ NLOFST ? V CS _ TOFST ? n ? R O
I FB ? R L _ MAX
=
0 . 64 * 10 ? 3 ? 20 * 10 ? 3 ? 0 . 55 * 10 ? 3 ? 6 ? 0 . 91 * 10 ? 3
90 * 10 ? 6 * 0 . 64 * 10 ? 3
= 162 ?
R DRP =
R FB ? R L _ MAX ? G CS _ MIN
n ? R O
=
162 ? 0 . 64 * 10 ? 3 * 30 . 2
6 ? 0 . 91 * 10 ? 3
= 576 ?
Page 26 of 34
9/30 /04
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