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| 型号： | ISL6443IRZ-TK |
| 厂商： | Intersil |
| 文件页数： | 14/18页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM DUAL 300KHZ 28-QFN |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 1,000 |
| 应用： | 电源 |
| 电流 - 电源： | 50µA |
| 电源电压： | 5.6 V ~ 24 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-VFQFN 裸露焊盘 |
| 供应商设备封装： | 28-QFN 裸露焊盘（5x5） |
| 包装： | 带卷 (TR) |
ISL6443
feedback resistor drains the excess charge. However,
C2
charge may build up on the output capacitor making V LDO
CONVERTER
R2
C1
rise above its set point. Care must be taken to insure that the
feedback resistor ’s current exceeds the pass transistors
EA
G M = 17.5dB
R1
TYPE 2 EA
leakage current over the entire temperature range.
The linear regulator output can be supplied by the output of
one of the PWMs. When using a PFET, the output of the
linear will track the PWM supply after the PWM output rises
to a voltage greater than the threshold of the PFET pass
MODULATOR
G EA = 18dB
device. The voltage differential between the PWM and the
F PO
F Z
F C
F P
linear output will be the load current times the r DS(ON) .
Figure 18 shows the linear regulator (2.5V) startup waveform
and the PWM (3.3V) startup waveform.
FIGURE 17. FEEDBACK LOOP COMPENSATION
The zero frequency, the amplifier high-frequency gain, and
the modulator gain are chosen to satisfy most typical
applications. The crossover frequency will appear at the
point where the modulator attenuation equals the amplifier
high frequency gain. The only task that the system designer
has to complete is to specify the output filter capacitors to
position the load main pole somewhere within one decade
lower than the amplifier zero frequency. With this type of
compensation plenty of phase margin is easily achieved due
to zero-pole pair phase ‘boost’.
Conditional stability may occur only when the main load pole
is positioned too much to the left side on the frequency axis
due to excessive output filter capacitance. In this case, the
ESR zero placed within the 1.2kHz to 30kHz range gives
some additional phase ‘boost’. Some phase boost can also
be achieved by connecting capacitor C Z in parallel with the
upper resistor R1 of the divider that sets the output voltage
value. Please refer to the output inductor and capacitor
selection sections for further details.
Linear Regulator
The linear regulator controller is a transconductance
amplifier with a nominal gain of 2A/V. The N-channel
MOSFET output device can sink a minimum of 50mA. The
reference voltage is 0.8V. With zero volts differential at it’s
input, the controller sinks 21mA of current. An external PNP
V OUT2 1V/DIV
V OUT3 1V/DIV
FIGURE 18. LINEAR REGULATOR STARTUP WAVEFORM
60
50
40
30
20
10
transistor or PFET pass element can be used. The dominant
pole for the loop can be placed at the base of the PNP (or
gate of the PFET), as a capacitor from emitter to base
0
0.79
0.8
0.81 0.82 0.83
FEEDBACK VOLTAGE (V)
0.84
0.85
(source to gate of a PFET). Better load transient response is
achieved however, if the dominant pole is placed at the
output, with a capacitor to ground at the output of the
regulator.
Under no-load conditions, leakage currents from the pass
transistors supply the output capacitors, even when the
transistor is off. Generally this is not a problem since the
14
FIGURE 19. LINEAR CONTROLLER GAIN
Base-Drive Noise Reduction
The high-impedance base driver is susceptible to system
noise, especially when the linear regulator is lightly loaded.
Capacitively coupled switching noise or inductively coupled
FN9044.2
August 9, 2006
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6443IRZ-TKS2698 | 制造商:Intersil Corporation 功能描述:LEAD-FREE DUAL PWM CONTROLLER + LINEAR CONT., 300KHZ, QFN, 5 - Tape and Reel 制造商:Rochester Electronics LLC 功能描述: |
| ISL6443IRZ-TS2698 | 制造商:Intersil Corporation 功能描述:LEAD-FREE DUAL PWM CONTROLLER + LINEAR CONTROLLER, 300KHZ, Q - Tape and Reel |
| ISL6444CA | 功能描述:电流型 PWM 控制器 Dual with DDR Memory 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 |
| ISL6444CA-T | 功能描述:IC CONTROLLER DDR 28-QSOP RoHS:否 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) |
| ISL6444CAZ | 功能描述:IC CONTROLLER DDR 28-QSOP 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 |
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