参数资料
| 型号： | ISL95874IRUZ-T |
| 厂商： | Intersil |
| 文件页数： | 17/29页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM 1PHASE GPU 16UTQFN |
| 标准包装： | 3,000 |
| 应用： | 控制器，GPU 内核电源 |
| 输入电压： | 3.3 V ~ 25 V |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 5 V |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-UFQFN 裸露焊盘 |
| 供应商设备封装： | 16-UTQFN（2.6x1.8） |
| 包装： | 带卷 (TR) |
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页第15页第16页当前第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
ISL95874, ISL95875, ISL95876
V OUT
R FB
FB
?
+
EA
V COMP
For the four given user selected reference voltages V SETx ,
Equation 14 needs to be satisfied in order to have non-zero
solution for R SETx .
V SET1 ? V SET2 + V SET3 ? V SET4 – V SET2 ? V SET3 – V SET2 ? V SET4 = 0
R SET1 = ---------------------------------------------------------------------------------------------------------
V REF ? ( V SET4 – V SET2 )
SREF
+
V SET
?
SW0
V REF
0.5V
(EQ. 14)
The programmed resistors R SET1 , R SET2 and R SET3 are designed
in the following way. First, assign an initial value to R SET3 of
approximately 100k Ω then calculate R SET1 and R SET2 using
Equations 15 and 16 respectively.
R SET3 ? ( V SET4 – V REF ) ? ( V SET2 – V REF )
(EQ. 15)
V SET4 – V SET2
SET0
SW1
R SET3 ? ( V SET2 – V REF )
R SET2 = -------------------------------------------------------------
(EQ. 16)
SET1
SW2
SW3
If additional flexibility is required in selecting V SET4 , then a fourth
resistor, R SET4 , can be added between the SET1 pin and the
R SET2 and R SET3 resistors; see Figure 11 on page 18. The
addition of this resistor allows adjustment of reference only when
SW3 is closed. The ISL95875 VSET4 reference setpoint is
defined in Equation 17:
V SET1 = V REF
V SET4 = V REF ? ? 1 + -------------------------------------------------------------------- ?
? R SET1 ?
? R SET3 ? R SET4 ? ?
R SET2 + ? ? ?
FIGURE 10. ISL95875 VOLTAGE PROGRAMMING CIRCUIT
Equations 10, 11, 12 and 13 give the specific V SET equations for
the ISL95875 setpoint reference voltages.
The ISL95875 V SET1 setpoint is written as Equation 10:
(EQ. 10)
? ?
? ?
(EQ. 17)
?
? ---------------------------------------
? ? R SET3 + R SET4 ? ?
The sum of all the programming resistors must be 300k Ω or
greater , as shown in Equation 18, otherwise adjust the value of
R SET3 and repeat the calculations.
The ISL95875 V SET2 setpoint is written as Equation 11:
R SET1 + R SET2 + R SET3 ≥ 300k Ω
(EQ. 18)
V SET2 = V REF ? ? 1 + --------------------------------------- ?
V SET3 = V REF ? ? 1 + --------------------------------------- ?
? R SET1 ?
? R SET2 + R SET3 ?
The ISL95875 V SET3 setpoint is written as Equation 12:
? R SET1 + R SET2 ?
? R SET3 ?
(EQ. 11)
(EQ. 12)
If the output voltage is in the range of 0.5V to 1.5V, the external
resistor-divider is not necessary. The output voltage is equal to
one of the reference voltages depending on the status of VID1
and VID0. The external resistor divider consisting of R FB and
R OFS allows the user to program the output voltage in the range
of 1.5V to 5V. The relation between the output voltage and the
V SET4 = V REF ? ? 1 + ---------------- ?
V OUT = V SREF ? ------------------------------ = V SREF ? k
The ISL95875 V SET4 setpoint is written as Equation 13:
? R SET1 ?
? R SET2 ?
(EQ. 13)
reference voltage is given in Equation 19:
R FB + R OFS
R OFS
(EQ. 19)
The V SET1 is fixed at 0.5V because it corresponds to the closure
of internal switch SW0 that configures the V SET amplifier as a
unity-gain voltage follower for the 0.5V voltage reference V REF .
Theoretically, V SET3 can be higher or lower or equal to V SET4
depending on the selection of R SET1 , R SET2 and R SET3 . However,
it is recommended to design the four reference voltages in the
following order:
- V SET1 < V SET2 < V SET3 < V SET4 Thus,
- V OUT1 < V OUT2 < V OUT3 < V OUT4
17
In this case, the four output voltages are equal to each of the
corresponding reference voltages multiplying the factor k.
V OUTx = V SETx ? k (EQ. 20)
FN7933.1
March 2, 2012
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| ISL95875HRUZ-T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL95875IRUZ-T | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| ISL95901IRZ-T | 制造商:Intersil Corporation 功能描述:PMIC SOLUTION FOR PORTABLE 3.3V/5V SYSTEM POWER, 5X6 QFN, TR - Tape and Reel |
| ISL96017UIRT8Z | 功能描述:IC POT DGTL 50K OHM 8-TDFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 接片:256 电阻（欧姆）:100k 电路数:2 温度系数:标准值 35 ppm/°C 存储器类型:易失 接口:6 线串行（芯片选择，递增，增/减） 电源电压:2.6 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) |
| ISL96017UIRT8Z-T | 功能描述:IC XDCP 128-TAP 50KOHM 8-TDFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 数字电位器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 接片:256 电阻（欧姆）:100k 电路数:2 温度系数:标准值 35 ppm/°C 存储器类型:易失 接口:6 线串行（芯片选择，递增，增/减） 电源电压:2.6 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) |
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