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參數(shù)資料
| 型號： | LTC3806EDE |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Synchronous Flyback DC/DC Controller |
| 中文描述： | 0.05 A SWITCHING CONTROLLER, 290 kHz SWITCHING FREQ-MAX, PDSO12 |
| 封裝： | 4 X 3 MM, PLASTIC, MO-229WGED, DFN-12 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 241K |
| 代理商： | LTC3806EDE |
8
LTC3806
3806f
OPERATIOU
Main Control Loop
The LTC3806 is a constant frequency, current mode
flyback converter controller. A secondary-side gate driver
capable of driving several MOSFET synchronous rectifiers
is provided. To insure best cross regulation, DC/DC con-
verters using this controller operate in forced continuous
conduction (current is always flowing in either the primary
or secondary winding(s) of the transformer.)
For circuit operation, please refer to the Block Diagram of
the IC and Figure 1. In normal operation, the primary-side
power MOSFET is turned on when the oscillator sets the
PWM latch and is turned off when the current comparator
C1 resets the latch. V
OUT1
is divided down and compared
to an internal 1.230V reference by error amplifier EA,
which outputs an error signal at the I
TH
pin. The voltage of
the I
TH
pin sets the current comparator C1 input threshold.
When the load current on either output increases, a fall in
the FB voltage relative to the reference voltage causes the
I
TH
pin to rise increasing the primary-side peak current
thereby maintaining regulation. Regulation of V
OUT2
is
indirect, occurring via transformer action.
The RUN pin and undervoltage comparators control
whether the IC is enabled or is in a low current state. With
the RUN pin below 1.139V, the chip is off and the input
supply current is typically only 50
μ
A. If the RUN pin is
above 1.230V, most internal circuitry remains off until V
IN
exceeds the undervoltage comparator UV2 threshold. This
reduces start-up current to approximately 80
μ
A allowing
smaller values for C1 and larger values for R1 to be used.
The undervoltage comparator UV1 keeps G1 and G2 low
until INTV
CC
voltage is >4.7V to insure that gate drivers
will switch the external power MOSFETs properly.
Prior to normal operation, soft-start pin SS is low clamp-
ing the output of the V-to-I converter to a low value causing
current comparator C1 to trip at a low threshold. Once
operation begins, the SS pin ramps up causing the clamp
voltage to rise as well. This allows progressively higher
trip points on comparator C1 and progressively higher
peak currents to be supplied to the primary of the trans-
former. Soft-start is completed when the voltage on the SS
pin exceeds the voltage on the I
TH
pin.
The nominal operating frequency of the LTC3806 is 250kHz.
Since forced continuous operation is used, the noise
spectrum over all operating conditions is well controlled
with virtually all noise occurring at the operating frequency
and its harmonics.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3806EDE#PBF | 功能描述:IC REG CTRLR FLYBACK PWM 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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) |
| LTC3806EDE#TR | 功能描述:IC REG CTRLR FLYBACK PWM 12-DFN RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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) |
| LTC3806EDE#TRPBF | 功能描述:IC REG CTRLR FLYBACK PWM 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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) |
| LTC3808EDE | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Sync Step Down 2.75V to 9.8V Input 14-Pin DFN EP |
| LTC3808EDE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 14-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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) |
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