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參數(shù)資料
| 型號： | LT3748HMS#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO12 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-16/12 |
| 文件頁數(shù)： | 27/30頁 |
| 文件大?。?/td> | 284K |
| 代理商： | LT3748HMS#PBF |
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LT3748
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3748fa
PIN FUNCTIONS
VIN (Pin 1) Input Voltage. This pin supplies current to the
internal start-up circuitry and is the reference voltage for
the feedback circuitry connected to the RFB pin. This pin
must be locally bypassed with a capacitor.
EN/UVLO (Pin 3): Enable/Undervoltage Lockout. A resistor
divider connected to VIN is tied to this pin to program the
minimum input voltage at which the LT3748 will operate.
At a voltage below ~0.5V, the part draws less than 1μA
quiescent current. When below 1.223V but above ~0.5V,
the part will draw quiescent current but will not regulate
the INTVCC supply or power the gate drive circuitry. Above
1.223V, all internal circuitry will start and the SS pin will
source 5μA. When EN/UVLO falls below 1.223V, 2.4μA is
sunk from the pin to provide programmable hysteresis
for undervoltage lockout.
INTVCC (Pin 5): Gate Driver Bias Voltage. This pin supplies
current to the internal gate driver circuitry of the LT3748.
The INTVCC pin must be locally bypassed with a capacitor.
This pin may also be connected to VIN if a third winding
is not used and if VIN ≤ 20V. If a third winding is used, the
INTVCC voltage should be lower than the input voltage for
proper operation.
GATE (Pin 6): N-Channel MOSFET Gate Driver Output.
Switches between INTVCC and GND.
SENSE (Pin 7): The Current Sense Input for the Control
Loop. Kelvin connect this pin to the positive terminal of
the switch current sense resistor, RSENSE, in the source
of the N-channel MOSFET. The negative terminal of the
current sense resistor should be connected to the GND
plane close to the IC.
GND (Pins 8, 9): Ground.
SS (Pin 10): Soft-Start Pin. This pin delays start-up and
clamps VC pin voltage. Soft-start timing is set by the size
of the external capacitor at the pin. Switching starts when
VSS reaches ~0.65V.
VC (Pin 11): Compensation Pin for the Internal Error
Amplifier. Connect a series RC from this pin to ground to
compensate the switching regulator. A 100pF capacitor in
parallel helps eliminate noise.
TC (Pin 12): Output Voltage Temperature Compensation.
Connect a resistor to ground to produce a current pro-
portional to absolute temperature to be sourced into the
RREF node. ITC = 0.55V/RTC.
RREF (Pin 14): Input Pin for the External Ground-Referred
Reference Resistor. The resistor at this pin should be 6.04k,
but for convenience in selecting a resistor divider ratio,
the value may range from 5.76k to 6.34k. The resistor
should be as close to the LT3748 as possible.
RFB (Pin 16): Input Pin for the External Feedback Resistor.
This pin is connected to the transformer primary at the
external MOSFET power switch. The ratio of this resistor
to the RREF resistor, times the internal bandgap reference,
determines the output voltage (plus the effect of any
non-unity transformer turns ratio). The average current
through this resistor during the flyback period should be
approximately 200μA. The resistor should be as close
to the LT3748 as possible.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT3748HMSTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100V Isolated Flyback Controller |
| LT3748IMS#PBF | 功能描述:IC REG CTRLR FLYBK ISO CM 16MSOP 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) |
| LT3748IMS#TRPBF | 功能描述:IC REG CTRLR FLYBK ISO CM 16MSOP 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) |
| LT3748IMSPBF | 制造商:Linear Technology 功能描述:100V Isolated Flyback Controller MSOP16 |
| LT3748IMSTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:100V Isolated Flyback Controller |
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