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参数资料
| 型号： | ISL6263BEVAL1Z |
| 厂商： | Intersil |
| 文件页数： | 14/18页 |
| 文件大小： | 0K |
| 描述： | EVAL BAORD 1 FOR ISL6263B |
| 标准包装： | 1 |
| 系列： | * |
ISL6263B
G 1 ( T ) = ---------------------------------------------------------------------
( 1 + 0.00393 ? ( T – 25 ° C ) )
The first step in droop load line compensation is to adjust
R NTCEQ , and R S such that the correct droop voltage
appears even at light loads between the VSUM and VO pins.
As a rule of thumb, the voltage drop V N across the R NTCEQ
network, is set to be 0.3 to 0.8 times V DCR . This gain,
defined as G 1 , provides a reasonable amount of light load
signal from which to derive the droop voltage.
The NTC network resistor value is dependent on
temperature and is given by Equation 9:
where G 1target is the desired ratio of V n / V DCR . Therefore,
the temperature characteristics G 1 is described by
Equation 14:
G 1t arg et
(EQ. 14)
It is recommended to begin your droop design using the
R NTC , R NTCS , and R NTCP component values of the
evaluation board available from Intersil.
R N ( T ) = ------------------------------------------------------------------------
( R NTC + R NTCS ) ? R NTCP
R NTC + R NTCS + R NTCP
(EQ. 9)
The gain of the droop amplifier circuit is expressed in
Equation 15:
R DRP1
G 1 , the gain of V N to V DCR , is also dependent on the
temperature of the NTC thermistor:
R DRP2
k droopamp = 1 + -------------------
(EQ. 15)
G 1 ( T ) = -------------------------------
R N ( T ) + R S
R N ( T )
(EQ. 10)
The inductor DCR is a function of temperature and is
After determining R S and R NTCEQ networks, use
Equation 16 to calculate the droop resistances R DRP1 and
R DRP2 .
R DRP2 = ? ? ------------------------------------------- ? – 1 ? ? R DRP1
approximately given by Equation 11:
DCR ( T ) = DCR 25 ° C ? ( 1 + 0.00393 ? ( T – 25 ° C ) )
(EQ. 11)
? ? R droop ? ?
? ? DCR ? G 1 ( 25 ° C ) ? ?
(EQ. 16)
The droop amplifier output voltage divided by the total load
current is given by Equation 12:
R droop = G 1 ( T ) ? DCR 25 ° C ? ( 1 + 0.00393 ? ( T – 25 ° C ) ) ? k droopamp
(EQ. 12)
R droop is the actual load line slope, and 0.00393 is the
temperature coefficient of the copper. To make R droop
independent of the inductor temperature, it is desired to
have:
R droop is 8m Ω per Intel IMVP-6+ specification and R DRP1 is
typically 1k Ω .
The effectiveness of the R NTCEQ network is sensitive to the
coupling coefficient between the NTC thermistor and the
inductor. The NTC thermistor should be placed in the closet
proximity of the inductor.
To see whether the NTC network successfully compensates
the DCR change over temperature, one can apply full load
current and wait for the thermal steady state and see how
G 1 ( T ) ? ( 1 + 0.00393 ? ( T – 25 ° C ) ) ? G 1t arg et
(EQ. 13)
much the output voltage deviates from the initial voltage
reading. A good compensation can limit the drift to less than
2mV. If the output voltage is decreasing when the temperature
increases, that ratio between the NTC thermistor value and
the rest of the resistor divider network has to be increased.
VDD
OCP
?
+
10 μ A
↓
+
OCSET
VSUM
R OCSET
R S
+
DROOP
?
DFB
DROOP
?
VO
V DCR
FIGURE 8. EQUIVALENT MODEL FOR DROOP CIRCUIT USING INDUCTOR DCR CURRENT SENSING
14
FN6388.3
July 8, 2010
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6263BHRZ | 功能描述:直流/直流开关调节器 1-PHS INT DC/DC BUCK CNTRLR IMVP6 5X5 WIT RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL6263BHRZ-T | 功能描述:直流/直流开关调节器 1-PHS INT DC/DC BUCK CNTRLR IMVP6 5X5 WIT RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| ISL6263C | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:5-Bit VID Single-Phase Voltage Regulator with Current Monitor for GPU Core Power |
| ISL6263CEVAL1 | 功能描述:EVAL BOARD 1 FOR ISL6263C RoHS:否 类别:编程器，开发系统 >> 评估板 - 线性稳压器 (LDO) 系列:* 产品变化通告:1Q2012 Discontinuation 30/Mar/2012 设计资源:NCP590MNDPTAGEVB Gerber Files 标准包装:1 系列:- 每 IC 通道数:2 - 双 输出电压:1.8V，2.8V 电流 - 输出:300mA 输入电压:2.1 ~ 5.5 V 稳压器类型:正，固定式 工作温度:-40°C ~ 85°C 板类型:完全填充 已供物品:板 已用 IC / 零件:NCP590MNDP 其它名称:NCP590MNDPTAGEVB-NDNCP590MNDPTAGEVBOS |
| ISL6263CHRZ | 功能描述:直流/直流开关调节器 1-PHS INT DC/DC BUCK CNTRLR IMVP-6 W/IMON RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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