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參數(shù)資料
| 型號： | LTC3856IFE#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO38 |
| 封裝： | 4.4 MM, LEAD FREE, PLASTIC, TSSOP-38 |
| 文件頁數(shù)： | 24/40頁 |
| 文件大?。?/td> | 2222K |
| 代理商： | LTC3856IFE#PBF |
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LTC3856
0
3856f
applicaTions inForMaTion
Phase-Locked Loop and Frequency Synchronization
The LTC3856 has a phase-locked loop (PLL) comprised of
an internal voltage-controlled oscillator (VCO) and a phase
detector. This allows the turn-on of the top MOSFET of
controller 1 to be locked to the rising edge of an external
clock signal applied to the PLLIN pin. The turn-on of the
second phase’s top MOSFETs is thus 180° out-of-phase
with the external clock, and so on. The phase detector is
an edge-sensitive digital type that provides zero degrees
phase shift between the external and internal oscillators.
This type of phase detector does not exhibit a false lock
to harmonics of the external clock.
Theoutputofthephasedetectorisapairofcomplementary
current sources that charge or discharge the internal filter
network. There is a precision 10A of current flowing out
of FREQ pin. This allows the user to use a single resistor to
SGNDtosettheswitchingfrequencywhennoexternalclock
is applied to the PLLIN pin. The internal switch between
the FREQ pin and the integrated PLL filter network is on,
allowing the filter network to be pre-charged at the same
voltage as of the FREQ pin. The relationship between the
voltage on the FREQ pin and operating frequency is shown
in Figure 15 and specified in the Electrical Characteristics
table. If an external clock is detected on the PLLIN pin, the
internal switch mentioned above turns off and isolates the
influence of the FREQ pin. Note that the LTC3856 can only
be synchronized to an external clock whose frequency is
within range of the LTC3856’s internal VCO. This is guar-
anteed to be between 250kHz and 770kHz. A simplified
block diagram is shown in Figure 16.
If the external clock frequency is greater than the inter-
nal oscillator’s frequency, fOSC, then current is sourced
continuously from the phase detector output, pulling up
the filter network. When the external clock frequency is
DIGITAL
PHASE/
FREQUENCY
DETECTOR
VCO
2.4V 5V
RSET
3856 F16
FREQ
SYNC
EXTERNAL
OSCILLATOR
PLLIN
Figure 16. Phase-Locked Loop Block Diagram
FREQ/PLLFLTR PIN VOLTAGE (V)
0
FREQUENCY
(kHz)
0.5
1
1.5
2
3856 F15
2.5
0
100
300
400
500
900
800
700
200
600
Figure 15. Relationship Between Oscillator
Frequency and Voltage at the FREQ Pin
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3856EFE#PBF | SWITCHING CONTROLLER, PDSO38 |
| LTC3856IUH#TRPBF | SWITCHING CONTROLLER, PQCC38 |
| LTC3856EFE#TRPBF | SWITCHING CONTROLLER, PDSO38 |
| LTC3860IUH#PBF | DUAL SWITCHING CONTROLLER, 1250 kHz SWITCHING FREQ-MAX, PQCC32 |
| LTC3862HUH#TRPBF | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC24 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3856IUH#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32WFQFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3856IUH#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 38-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3857EGN-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
| LTC3857EGN-1#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC3857EUH#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 特色產(chǎn)品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 標(biāo)準(zhǔn)包裝:1 系列:PowerWise® PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:81% 電源電壓:4.5 V ~ 18 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-5°C ~ 125°C 封裝/外殼:32-WFQFN 裸露焊盤 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1303 (CN2011-ZH PDF) 其它名稱:LM3754SQDKR |
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