参数资料
| 型号： | ISL95874IRUZ-T |
| 厂商： | Intersil |
| 文件页数： | 20/29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) |
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ISL95874, ISL95875, ISL95876
R3 LOOP GAIN (dB)
INTEGRATOR POLE
R4 LOOP GAIN (dB)
p1
L/C DOUBLE-POLE
p1
L/C DOUBLE-POLE
p2
p3
-20dB CROSSOVER
REQUIRED FOR STABILITY
p2
SYSTEM HAS 2 POLES
AND 1 ZERO
NO COMPENSATOR IS
CURRENT-MODE
ZERO z1
COMPENSATOR TO
ADD z2 IS NEEDED
CURRENT-MODE
ZERO
z1
NEEDED
f (Hz)
f (Hz)
FIGURE 14. UNCOMPENSATED INTEGRATOR OPEN-LOOP
RESPONSE
Figure 13 illustrates the classic integrator configuration for a
voltage loop error-amplifier. While the integrator provides the
high DC gain required for accurate regulation in traditional
technologies, it also introduces a low-frequency pole into the
control loop. Figure 14 shows the open-loop response that results
from the addition of an integrating capacitor in the voltage loop.
The compensation components found in Figure 13 are necessary
to achieve stability.
Because R 4 does not require a high-gain voltage loop, the
FIGURE 16. UNCOMPENSATED R 4 OPEN-LOOP RESPONSE
Transient Response
In addition to requiring a compensation zero, the integrator in
traditional architectures also slows system response to transient
conditions. The change in COMP voltage is slow in response to a
rapid change in output voltage. If the integrating capacitor is
removed, COMP moves as quickly as V OUT , and the modulator
immediately increases or decreases switching frequency to
recover the output voltage.
I OUT
integrator can be removed, reducing the number of inherent
poles in the loop to two. The current-mode zero continues to
cancel one of the poles, ensuring a single-pole crossover for a
wide range of output filter choices. The result is a stable system
V COMP
R 4
R 3
t
with no need for compensation components or complex
equations to properly tune the stability.
R2
V OUT
V OUT
t
R 1
V COMP
t
V DAC
FIGURE 15. NON-INTEGRATED R4 ERROR-AMPLIFIER
CONFIGURATION
Figure 15 shows the R 4 error-amplifier that does not require an
integrator for high DC gain to achieve accurate regulation. The
result to the open loop response can be seen in Figure 16.
20
FIGURE 17. R 3 vs R 4 IDEALIZED TRANSIENT RESPONSE
The dotted red and blue lines in Figure 17 represent the time
delayed behavior of V OUT and V COMP in response to a load
transient when an integrator is used. The solid red and blue lines
illustrate the increased response of R 4 in the absence of the
integrator capacitor.
Diode Emulation
The polarity of the output inductor current is defined as positive
when conducting away from the phase node, and defined as
negative when conducting towards the phase node. The DC
component of the inductor current is positive, but the AC
component known as the ripple current, can be either positive or
negative. Should the sum of the AC and DC components of the
inductor current remain positive for the entire switching period,
the converter is in continuous-conduction-mode (CCM). However,
if the inductor current becomes negative or zero, the converter is
in discontinuous-conduction-mode (DCM).
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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