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参数资料
| 型号： | L6725A |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 20 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | SOP-16 |
| 文件页数： | 13/34页 |
| 文件大小： | 962K |
| 代理商： | L6725A |
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Application details
L6725 - L6725A
20/32
6.4
Compensation network
The loop is based on a voltage mode control (Figure 14). The output voltage is regulated to the
internal/external reference voltage and scaled by the external resistor divider. The error
amplifier output VCOMP is then compared with the oscillator triangular waveform to provide a
pulse-width modulated (PWM) with an amplitude of VIN at the PHASE node. This waveform is
filtered by the output filter. The modulator transfer function is the small signal transfer function
of VOUT/VCOMP. This function has a double pole at frequency FLC depending on the L-COUT
resonance and a zero at FESR depending on the output capacitor’s ESR. The DC Gain of the
modulator is simply the input voltage VIN divided by the peak-to-peak oscillator voltage: VOSC.
The compensation network consists in the internal error amplifier, the impedance networks ZIN
(R3, R4 and C20) and ZFB (R5, C18 and C19). The compensation network has to provide a
closed loop transfer function with the highest 0dB crossing frequency to have fastest transient
response (but always lower than fSW/10) and the highest gain in DC conditions to minimize the
load regulation error. A stable control loop has a gain crossing the 0dB axis with -20dB/decade
slope and a phase margin greater than 45°. To locate poles and zeroes of the compensation
networks, the following suggestions may be used:
Figure 14. Compensation Network
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6725ATR | 功能描述:开关变换器、稳压器与控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6725TR | 功能描述:电压模式 PWM 控制器 Adjustable Step Down Controller RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| L6726 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726_08 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
| L6726_12 | 制造商:UTC-IC 制造商全称:UTC-IC 功能描述:UNIVERSAL SPEECH CIRCUIT |
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