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参数资料
| 型号： | ISL6261EVAL1Z |
| 厂商： | Intersil |
| 文件页数： | 19/34页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR ISL6261 1 QFN |
| 标准包装： | 1 |
| 系列： | * |
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ISL6261
10uA
OC
OCSET
VSUM
R ocset
VO
R s
Internal to
ISL6261
DROOP
DFB
1
DROOP
VO
R par
R series
V dcr
I o DCR
R ntc
R n
(R ntc +R series ) R par
R ntc +R series +R par
FIGURE 9. EQUIVALENT MODEL FOR DROOP CIRCUIT USING DCR SENSING
Static Mode of Operation - Static Droop Using DCR
Sensing
G1, the gain of V n to V DCR , is also dependent on the
temperature of the NTC thermistor:
The ISL6261 has an internal differential amplifier to
accurately regulate the voltage at the processor die.
Δ
G 1 ( T ) =
R n ( T )
R n ( T ) + R s
(EQ. 17)
For DCR sensing, the process to compensate the DCR
resistance variation takes several iterative steps. Figure 2
shows the DCR sensing method. Figure 9 shows the
The inductor DCR is a function of the temperature and is
approximately given by
simplified model of the droop circuitry. The inductor DC
current generates a DC voltage drop on the inductor DCR.
DCR ( T ) = DCR 25 C ? ( 1 + 0 . 00393 * ( T ? 25 ))
(EQ. 18)
Equation 15 gives this relationship.
in which 0.00393 is the temperature coefficient of the copper.
V DCR = I o × DCR
(EQ. 15)
The droop amplifier output voltage divided by the total load
current is given by:
An R-C network senses the voltage across the inductor to
get the inductor current information. R n represents the NTC
R droop = G 1 (T) ? DCR ( T ) ? k droopamp
(EQ. 19)
network consisting of R ntc , R series and R par . The choice of R s
will be discussed in the next section.
R droop is the actual load line slope. To make R droop
independent of the inductor temperature, it is desired to
The first step in droop load line compensation is to choose
R n and R s such that the correct droop voltage appears even
at light loads between the VSUM and VO nodes. As a rule of
have:
G 1 ( T ) ? ( 1 + 0 . 00393 * ( T ? 25 )) ? G 1 t arg et
(EQ. 20)
thumb, the voltage drop across the R n network, V n , is set to
be 0.5-0.8 times V DCR . This gain, defined as G1, provides a
where G 1target is the desired ratio of V n /V DCR . Therefore, the
temperature characteristics G 1 is described by:
fairly reasonable amount of light load signal from which to
derive the droop voltage.
The NTC network resistor value is dependent on the
G 1 ( T ) =
G 1 t arg et
( 1 + 0 . 00393 * ( T ? 25 )
(EQ. 21)
temperature and is given by:
For different G1 and NTC thermistor preference, Intersil
R n ( T ) =
( R series + R ntc ) ? R par
R series + R ntc + R par
19
(EQ. 16)
provides a design spreadsheet to generate the proper value
of R ntc , R series , R par .
FN9251.1
September 27, 2006
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| ISL6261IR7Z | 功能描述:IC DC/DC BUCK CTRLR 1PH 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6261IR7Z-T | 功能描述:IC DC/DC BUCK CTRLR 1PH 48-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6261IRZ | 功能描述:IC DC/DC BUCK CTRLR 1PH 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| ISL6261IRZ-T | 功能描述:IC DC/DC BUCK CTRLR 1PH 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6262A | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Two-Phase Core Controller Santa Rosa, IMVP-6 |
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