参数资料
| 型号： | ISL6263CRZ |
| 厂商： | Intersil |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC VREG CORE 5BIT 1PHASE 32-QFN |
| 标准包装： | 60 |
| 应用： | 转换器，Intel IMVP-6 |
| 输入电压： | 5 V ~ 25 V |
| 输出数： | 1 |
| 输出电压： | 0.41 V ~ 1.29 V |
| 工作温度： | -10°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-QFN（5x5） |
| 包装： | 管件 |
ISL6263
R N ( T ) = ------------------------------------------------------------------------
R NTC + R NTCS + R NTCP
RBIAS Current Reference
The RBIAS pin is internally connected to a 1.545V reference
through a 3k Ω resistance. A bias current is established by
connecting a ±1% tolerance, 150k Ω resistor between the
RBIAS and VSS pins. This bias current is mirrored, creating the
OCSET reference current I OCSET that is sourced from the
OCSET pin. Do not connect any other components to this
pin, as they will have a negative impact on the performance
of the IC.
I2UA Current Reference
The I2UA pin is connected to a 2μA current source I I2UA . This
current source is made available for implementing a voltage
offset of the commanded VID states. A 20k Ω resistor R I2UA
should be connected across the I2UA and VSS pins if the I I2UA
current source is unused.
Setting the PWM Switching Frequency
The R 3 modulator scheme is not a fixed-frequency
architecture, lacking a fixed-frequency clock signal to
produce PWM. The switching frequency increases during
the application of a load to improve transient performance.
The static PWM frequency varies slightly depending on the
shows the DCR sensing method. Figure 8 shows the
simplified model of the droop circuitry. The inductor DC
current generates a DC voltage drop on the inductor DCR.
Equation 7 gives this relationship:
V DCR = I o ? DCR (EQ. 7)
An R-C network senses the voltage across the inductor to
get the inductor current information. R NTCEQ represents the
NTC network consisting of R NTC , R NTCS, and R NTCP . The
choice of R S will be discussed in the next section.
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 0.5x to 0.8x 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 8:
( R NTC + R NTCS ) ? R NTCP
(EQ. 8)
G 1 ( T ) = -------------------------------
input voltage, output voltage, and output current, but this
variation is normally less than 10% in continuous conduction
mode.
Refer to Figure 2, and find that resistor R FSET is connected
between the V W and COMP pins. A current is sourced from
G 1 , the gain of V N to V DCR , is also dependent on the
temperature of the NTC thermistor:
R N ( T )
R N ( T ) + R S
(EQ. 9)
VW through R FSET creating the synthetic ripple window
voltage signal V W which determines the PWM switching
frequency. The relationship between the resistance of R FSET
and the switching frequency in CCM is approximately given by
The inductor DCR is a function of temperature and is
approximately given by Equation 10:
DCR ( T ) = DCR 25 ° C ? ( 1 + 0.00393 ? ( T – 25 ° C ) ) (EQ. 10)
R FSET = ----------------------------------------------------
( T – 0.29 × 10
) ? 47
Equation 5:
1
– 6
(EQ. 5)
The droop amplifier output voltage divided by the total load
current is given by Equation 11:
7 × 10 = ----------------------------------------------------------------------------
(EQ. 6)
( 3.33 × 10
– 0.29 × 10
) ? 47
For example, the value of R FSET for 300kHz operation is
approximately:
3 1
– 6 – 6
This relationship only applies to operation in constant
conduction mode because the PWM frequency naturally
R droop = G 1 ( T ) ? DCR 25 ° C ? ( 1 + 0.00393 ? ( T – 25 ° C ) ) ? k droopamp
(EQ. 11)
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 Equation 12:
decreases as the load decreases while in diode emulation
mode. Note that the Electrical Specifications table gives the
G 1 ( T ) ? ( 1 + 0.00393 ? ( T – 25 ° C ) ) ? G 1t arg et
(EQ. 12)
G 1 ( T ) = ---------------------------------------------------------------------
( 1 + 0.00393 ? ( T – 25 ° C ) )
nominal PWM frequency of 333kHz with R FSET = 7k Ω ,
different from the result of equation Equation 6. This is
because the IC is trimmed with V COMP = 2V which is higher
than the typical value encountered in a typical application.
Static Droop Design Using DCR Sensing
The ISL6263 has an internal differential amplifier to
accurately regulate the voltage at the processor die.
For DCR sensing, the process to compensate the DCR
resistance variation takes several iterative steps. Figure 2
14
where G 1target is the desired ratio of V n / V DCR . Therefore,
the temperature characteristics G 1 is described by
Equation 13:
G 1t arg et
(EQ. 13)
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.
FN9213.2
June 10, 2010
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6263CRZ-T | 功能描述:直流/直流开关调节器 1 PHS INT DC/DC BUCK CNTRLR FOR INTEL 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 |
| ISL6263DEVAL1Z | 功能描述:EVAL BAORD 1 FOR ISL6263D RoHS:是 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:* 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:True Shutdown™ 主要目的:DC/DC，步升 输出及类型:1，非隔离 功率 - 输出:- 输出电压:- 电流 - 输出:1A 输入电压:2.5 V ~ 5.5 V 稳压器拓扑结构:升压 频率 - 开关:3MHz 板类型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| ISL6263DHRZ | 功能描述:IC VREG 3BIT 1PHASE 32-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) |
| ISL6263DHRZ-T | 功能描述:IC VREG 3BIT 1PHASE 32-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 |
| ISL6263EVAL1 | 制造商:Intersil Corporation 功能描述:ISL6263 EVALUATION BOARD 1 - IMVP LICENSE REQUIRED - Bulk |
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