參數(shù)資料
型號(hào)： L6732TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, HTSSOP-16
文件頁(yè)數(shù)： 17/37頁(yè)
文件大?。?/td> 898K
代理商： L6732TR
Application details
L6732
24/37
Where D is the duty cycle. The equation reaches its maximum value, IOUT /2 with D = 0.5.
The losses in worst case are:
Equation 12
6.4
Compensation network
The loop is based on a voltage mode control (Figure 18.). 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 wave 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:
●
Modulator singularity frequencies:
Equation 13
2
)
5
.
0
(
Iout
ESR
P
=
Figure 18.
Compensation network
Cout
L
LC
=
1
ω
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6733 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller
L6733TR 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Advanced modular synchronous PWM controller
L6738 功能描述:電流型 PWM 控制器 Single-Phase SD Cont 5V to 12V bus 1.5V RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6738A 功能描述:電流型 PWM 控制器 Single-phase PWM Light Load EFF RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
L6738ATR 功能描述:電流型 PWM 控制器 Single Phase PWM CNTRL Light-Load EFF RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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