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参数资料
| 型号： | LT3574EMS#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.1 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | LEAD FREE, PLASTIC, MSOP-16 |
| 文件页数： | 20/24页 |
| 文件大小： | 285K |
| 代理商： | LT3574EMS#PBF |
LT3574
3574f
pin Functions
BIAS: Bias Voltage. This pin supplies current to the switch
driver and internal circuitry of the LT3574. This 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
≤ 15V. If a third winding is used, the BIAS voltage should
be lower than the input voltage for proper operation.
GND: Ground.
RFB: Input Pin for External Feedback Resistor. This pin is
connected to the transformer primary (VSW). 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 200A. For nonisolated
applications, this pin should be connected to VIN.
RILIM: Maximum Current Limit Adjust Pin. A resistor
should be tied to this pin to ground to set the current
limit. Use a 10k resistor for the full current capabilities
of the switch.
RREF: Input Pin for External Ground-Referred Reference
Resistor. This resistor should be in the range of 6k, but
for convenience, need not be precisely this value. For
nonisolated applications, a traditional resistor voltage
divider may be connected to this pin.
SHDN/UVLO:Shutdown/UndervoltageLockout.Aresistor
divider connected to VIN is tied to this pin to program the
minimum input voltage at which the LT3574 will operate.
At a voltage below ~0.7V, the part draws no quiescent
current. When below 1.22V and above ~0.7V, the part will
draw 10A of current, but internal circuitry will remain
off. Above 1.22V, the internal circuitry will start and a 7A
current will be fed into the SS pin. When this pin falls
below 1.22V, 2.5A will be pulled from the pin to provide
programmable hysteresis for UVLO.
SS: Soft-Start Pin. Place a soft-start capacitor here to
limit start-up inrush current and output voltage ramp
rate. Switching starts when the voltage at this pin reaches
~0.7V.
SW: Collector Node of the Output Switch. This pin has
large currents flowing through it. Keep the traces to the
switching components as short as possible to minimize
electromagnetic radiation and voltage spikes.
TC: Output Voltage Temperature Compensation. Connect
a resistor to ground to produce a current proportional to
absolute temperature to be sourced into the RREF node.
ITC = 0.55V/RTC.
TEST: This pin is used for testing purposes only and must
be connected to ground for the part to operate properly.
VC:CompensationPinforInternalErrorAmplifier.Connect
a series RC from this pin to ground to compensate the
switching regulator. A 100pF capacitor in parallel helps
eliminate noise.
VIN: Input Voltage. This pin supplies current to the internal
start-up circuitry and as a reference voltage for the DCM
comparatorandfeedbackcircuitry.Thispinmustbelocally
bypassed with a capacitor.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3574EMSTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3574IMS | 制造商:LINER 制造商全称:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
| LT3574IMS#PBF | 功能描述:IC REG FLYBK ISO ADJ .65A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3574IMS#TRPBF | 功能描述:IC REG FLYBK ISO ADJ .65A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3574IMSPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Isolated Flyback Converter Without an Opto-Coupler |
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