- 您现在的位置：买卖IC网 > PDF目录1808 > IR3086AMPBF (International Rectifier)IC PHASE CONTROLLER OVP 20MLPQ PDF资料下载
参数资料
| 型号： | IR3086AMPBF |
| 厂商： | International Rectifier |
| 文件页数： | 15/33页 |
| 文件大小： | 0K |
| 描述： | IC PHASE CONTROLLER OVP 20MLPQ |
| 标准包装： | 100 |
| 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： | *IR3086AMPBF |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页当前第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页
IR3086APbF
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
(8), 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 )]
(8)
The current sense amplifier gain 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 (9).
G CS _ MIN = G CS _ ROOM ? [ 1 ? 1470 * 10 ? 6 ? ( T IC _ MAX ? T ROOM )]
(9)
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 ?
(10)
The over current limit is set by the external resistor R OCSET as defined in Equation (11), 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 of IR3081A Data Sheet. K P is the ratio of inductor peak current over
average current in each phase and is calculated from Equation (12).
R OCSET = [
I LIMIT
n
? R L _ MAX ? ( 1 + K P ) + V CS _ TOFST ] ? G CS _ MIN / I OCSET
(11)
K P =
( V I ? V O ) ? V O /( L ? V I ? f SW ? 2 )
I O / n
(12)
No Load Output Voltage Setting Resistor R FB and Adaptive Voltage Positioning Resistor R DRP
A resistor between FB pin and the converter output 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. Adaptive voltage positioning further
lowers the converter voltage by R O *I O, where R O is the required output impedance of the converter.
R FB is not only determined by I FB , the current flowing out of FB pin as shown in Figure 14 of IR3081A Data Sheet,
but also affected by the adaptive voltage positioning resistor R DRP and total input offset voltage of current sense
amplifiers. R FB and R DRP are determined by (13) and (14) respectively.
R FB =
R L _ MAX ? V O _ NLOFST ? V CS _ TOFST ? n ? R O
I FB ? R L _ MAX
(13)
R DRP =
R FB ? R L _ MAX ? G CS _ MIN
n ? R O
(14)
Body Braking
TM
Related Resistors R BBFB and R BBDRP
The Body Braking
TM
during Dynamic VID can be disabled by connecting BBFB pin to ground. If the feature is
enabled, Resistors R BBFB and R BBDRP are needed to restore the feedback voltage of the error amplifier after
Dynamic VID step down. Usually R BBFB and R BBDRP are chosen to match R FB and R DRP respectively .
Page 15 of 33
May 13, 2009
相关PDF资料 |
PDF描述 |
|---|---|
| IR3086MPBF | IC CONTROLLER PHASE 20MLPQ |
| IR3087MPBF | IC XPHASE W/OVP/TM CTRL 20MLPQ |
| IR3087M | IC XPHASE W/OVP/TM CTRL 20-MLPQ |
| IR3088AMPBF | IC XPHASE CONTROL 20L-MLPQ |
| IR3088AMTR | IC XPHASE W/FAULT DET 20L-MLPQ |
相关代理商/技术参数 |
参数描述 |
|---|---|
| IR3086AMPBF | 制造商:International Rectifier 功能描述:Controller IC Package/Case:20-MLPQ |
| IR3086AMTR | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASETM PHASE IC WITH OVP, FAULT AND OVERTEMP DETECT |
| IR3086AMTRPBF | 功能描述:开关变换器、稳压器与控制器 XPHASE PHASE IC Overtemp 2.5A 200ns 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 |
| IR3086AMTRPBF-CUT TAPE | 制造商:IR 功能描述:IR3086APbF Series 14 V 400 KHz Phase IC Combined with an IR XPhaseTM Control IC |
| IR3086APBF | 制造商:IRF 制造商全称:International Rectifier 功能描述:XPHASE PHASE IC WITH OVP, FAULT AND OVERTEMP DETECT |
发布紧急采购，3分钟左右您将得到回复。