參數(shù)資料
型號(hào)： LTC3862HUH#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC24
封裝： 5 X 5 MM, 0.65 MM PITCH, LEAD FREE, PLASTIC, QFN-24
文件頁(yè)數(shù)： 16/40頁(yè)
文件大小： 613K
代理商： LTC3862HUH#TRPBF
LTC3862
23
3862fb
OPERATION
Figure 17. Load Step Response of a Properly
Compensated Boost Converter
ILOAD
5A/DIV
1A TO 5A
IL1
5A/DIV
IL2
5A/DIV
VOUT
500mV/DIV
500μs/DIV
VIN = 24V
VOUT = 48V
3862 F17
The ITH series RC CC lter sets the dominant pole-zero
loop compensation. The transfer function for boost and
yback converters contains a right half plane zero that
normally requires the loop crossover frequency to be
reduced signicantly in order to maintain good phase
margin. The RC CC lter values can typically be modied
slightly (from 0.5 to 2 times their suggested values) to
optimize transient response once the nal PC layout is done
and the particular output capacitor type(s) and value(s)
have been determined. The output capacitor conguration
needs to be selected in advance because the effective ESR
and bulk capacitance have a signicant effect on the loop
gain and phase. An output current pulse of 20% to 80%
of full-load current having a rise time of 1μs to 10μs will
produce output voltage and ITH pin waveforms that will
give a sense of the overall loop stability without breaking
the feedback loop. Placing a power MOSFET and load
resistor directly across the output capacitor and driving
the gate with an appropriate signal generator is a practi-
cal way to produce a fast load step condition. The initial
output voltage step resulting from the step change in the
output current may not be within the bandwidth of the
feedback loop, so this signal cannot be used to determine
phase margin. This is why it is better to look at the ITH
pin signal which is in the feedback loop and is the ltered
and compensated control loop response. The gain of the
loop will be increased by increasing RC and the bandwidth
of the loop will be increased by decreasing CC. If RC is
increased by the same factor that CC is decreased, the
zero frequency will be kept the same, thereby keeping the
phase shift the same in the most critical frequency range
of the feedback loop. The output voltage settling behavior
is related to the stability of the closed-loop system and
will demonstrate the actual overall supply performance.
Figure 17 illustrates the load step response of a properly
compensated boost converter.
相關(guān)PDF資料
PDF描述
LTC3862IFE#PBF DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24
LTC3862HFE#PBF DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24
LTC3862EGN#TRPBF DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24
LTC3862IUH#PBF DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC24
LTC3862EGN#PBF DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3862IFE#PBF 功能描述:IC REG CTRLR BST PWM CM 24-TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC3862IFE#TRPBF 功能描述:IC REG CTRLR BST PWM CM 24-TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC3862IFE-1#PBF 功能描述:IC REG CTRLR BST PWM CM 24-TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC3862IFE-1#TRPBF 功能描述:IC REG CTRLR BST PWM CM 24-TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
LTC3862IFE-2#PBF 功能描述:IC REG CTRLR BST PWM CM 24-TSSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱(chēng):LM1771SSDX
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