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參數(shù)資料
| 型號： | LTC3833EUDC#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 14/36頁 |
| 文件大?。?/td> | 513K |
| 代理商： | LTC3833EUDC#TRPBF |
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LTC3833
21
3833f
APPLICATIONS INFORMATION
the internally calculated on-time differs significantly from
the real on-time required by the application. For example,
if there are differences between the local output point and
theremotelyregulatedoutputpointduetolinelosses,then
the internally calculated on-time will be inaccurate. Lower
efficiencies in the switching regulator can also cause the
real on-time to be significantly different from the internally
calculated on-time (see Efficiency Considerations). For
these circumstances, the voltage on the VOUT pin can
be programmed with a resistive divider from INTVCC or
from the regulator’s output itself. Note that there is a 500k
nominal resistance looking into the VOUT pin.
The PLL adjusted on-time achieved after phase locking is
the steady-state on-time required by the switching regula-
tor, and if the VOUT programmed on-time is substantially
equal to this steady-state on-time, then the PLL system
does not have to use its ±30% frequency lock range for
systematiccorrections.Insteadthelockrangecanbeused
tocorrectforcomponentvariationsorotheroperatingpoint
conditions. If needed, the VOUT pin can be programmed
to achieve the steady-state on-time as required by the
application and therefore maintain constant frequency
operation.
If the application requires very low on-times approaching
minimum on-time, the PLL system may not be able to
maintain a ±30% synchronization range. In fact, there is
a possibility of losing phase/frequency lock at minimum
on-time, and definitely losing phase/frequency lock for
applications requiring less than minimum on-time. This
is discussed further under Minimum On-Time, Minimum
Off-Time and Dropout Operation.
During dynamic transient conditions either in the line or
load (e.g., load step or release), the LTC3833 may lose
phaseandfrequencylockintheprocessofachievingfaster
transient response. For large slew rates (e.g., 10A/s),
phase and frequency lock will be lost (see Figure 7) until
the system returns back to a steady-state condition at
which point the device will resume frequency lock and
eventually achieve phase lock to the external clock. For
relatively small slew rates (10A/s), phase and frequency
lock can still be maintained.
Figure 6b. Setup for Coincident and Ratiometric Tracking
Figure 6a. Two Different Modes of Output Tracking
TIME
Coincident Tracking
EXTERNAL
SUPPLY
EXTERNAL
SUPPLY
VOUT
VOLTAGE
VOUT
TIME
3833 F06
Ratiometric Tracking
VOLTAGE
RFB2
EXT. V
RFB1
Coincident Tracking Setup
TO
TRACK/SS
RFB2
VOUT
TO VOSNS+
RFB1
TO VOSNS–
R1
EXT. V
R2
R1+ R2 ≥
R2
TO
TRACK/SS
RFB2
VOUT
TO VOSNS+
RFB1
TO VOSNS–
3833 F06b
Ratiometric Tracking Setup
0.6V
EXT. V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC3833IFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 類別: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: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) |
| LTC3833IFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 類別: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: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) |
| LTC3833IUDC#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN RoHS:是 類別: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: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) |
| LTC3833IUDC#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN RoHS:是 類別: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: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) |
| LTC3834EDHC-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-DFN RoHS:是 類別: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:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
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