参数资料
| 型号： | ISL6269IRZ |
| 厂商： | Intersil |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-QFN |
| 标准包装： | 75 |
| 系列： | Robust Ripple Regulator™ (R³) |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 电源电压： | 7 V ~ 25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 100°C |
| 封装/外壳： | 16-VQFN 裸露焊盘 |
| 包装： | 管件 |
ISL6269
Programming the Output Voltage
When the converter is in regulation there will be 600mV from
the FB pin to the GND pin. Connect a two-resistor voltage
R2
C2
C1
divider across the VO pin and the GND pin with the output
node connected to the FB pin. Scale the voltage-divider
network such that the FB pin is 600mV with respect to the
GND pin when the converter is regulating at the desired
output voltage. The output voltage can be programmed from
COMP
-
FB
R1
600mV to 3.3V.
Programming the output voltage is written as:
EA
+
R TOP + R BOTTOM
R BOTTOM
V REF = V OUT ? ---------------------------------------------------
Where:
(EQ. 5)
REF
FSET
- V OUT is the desired output voltage of the converter
- V REF is the voltage that the converter regulates to
between the FB pin and the GND pin
- R TOP is the voltage-programming resistor that connects
from the FB pin to the VO pin. In addition to setting the
output voltage, this resistor is part of the loop
compensation network
- R BOTTOM is the voltage-programming resistor that
connects from the FB pin to the GND pin
R 3 MODULATOR
VO
R FSET
V OUT
C FSET
Beginning with R TOP between 1k Ω to 5k Ω, calculating
R BOTTOM is written as:
VIN
VIN
R BOTTOM = -------------------------------------
V REF ? R TOP
V OUT – V REF
(EQ. 6)
UG
Q HIGH_SIDE
Programming the PWM Switching Frequency
PHASE
The ISL6269 does not use a clock signal to produce PWM.
The PWM switching frequency f SW is programmed by the
L OUT
DCR
resistor R FSET that is connected from the FSET pin to the
GND pin. The approximate PWM switching frequency is
GATE DRIVERS
Q LOW_SIDE
C OUT
f SW = ---------------------------
written as:
1
K ? R FSET
(EQ. 7)
LG
GND
C ESR
R FSET = ------------------
Estimating the value of R FSET is written as:
1
K ? f SW
Where:
(EQ. 8)
ISL6269
FIGURE 6. COMPENSATION REFERENCE CIRCUIT
R FSET is the f SW programming resistor
- f SW is the PWM switching frequency
-
- K = 75 x 10 -12
It is recommended that whenever the control loop
compensation network is modified, f SW should be checked
for the correct frequency and if necessary, adjust R FSET .
Compensation Design
The LC output filter has a double pole at its resonant frequency
that causes the phase to abruptly roll downward. The R 3
modulator used in the ISL6269 makes the LC output filter
resemble a first order system in which the closed loop stability
can be achieved with a Type II compensation network.
10
Your local Intersil representative can provide a PC-based
tool that can be used to calculate compensation network
component values and help simulate the loop frequency
response. The compensation network consists of the internal
error amplifier of the ISL6269 and the external components R1,
R2, C1, and C2 as well as the frequency setting components
R FSET , and C FSET, are identified in the schematic Figure 6.
General Application Design Guide
This design guide is intended to provide a high-level
explanation of the steps necessary to create a single-phase
power converter. It is assumed that the reader is familiar with
many of the basic skills and techniques referenced below. In
FN9177.3
June 25, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6269IRZ-T | 功能描述:IC REG CTRLR BUCK PWM 16-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:Robust Ripple Regulator™ (R³) 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
| ISL6271A | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Integrated XScale Regulator |
| ISL6271ACR | 功能描述:IC REG PMIC 1BUCK 2LDO 20-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| ISL6271ACR-T | 功能描述:IC PMIC XSCALE PROCESSOR 20-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| ISL6271ACRZ | 功能描述:直流/直流开关调节器 LD PLL & SRAMG FOR I NTEL PROCESSORS IBM 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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