高性能电流模式PWM控制器，专为高性价比AC/DC 转换器设计，在85~265V的宽电压范围内提供高可达12W/15W/18W的连续输出功率。优化的高合理性电路设 计结合高性价比的双极制作工艺，大程度上节约了产品 的整体成本。该电源控制器可工作于典型的反激电路拓扑 中，构成简洁的AC/DC转换器，IC内部启动电路被设计成 一种独特的电流吸入方式，可利用功率开关管的本身放大 作用完成启动（开关管lc对lb的放大），这显著地降低了 启动电阻的功率消耗，而在输出功率较小时，IC将自动降 低工作频率，从而实现了极低的待机功耗，vCC达到9.9V/12V/22.5V时，芯片内部会启动过压保护，限制输出 电压上升可防止光耦或反馈电路损坏引起的输出电压过 高，IC内部还提供了完善的防过载，防饱和功能，可实时 防范过载、变压器饱和、输出短路等异常状况，提高了电 源的可靠性。IC内部还集成了带有迟滞的温度保护功能， 在芯片过热时关断输出。电流限制可由外部器件Rs设定， 根据不同功率要求可适当徵调Rs. 应用场合：电源适配器 便携式设备充电电源 电池充电器 DVD/DVB电源 ATX待机电源 封装形式： 8- pin DIP8 7- pin DIP7 SOP7
The LY73XX series is a set of three-terminal, low power, high voltage regulators implemented in CMOS ogy. The series features extremely low quiescent cur-technol-rent which is typically 4uμA. They high as 12V. The device provides large current with aallow input voltages as significantly small dropout voltage.
The LY73XX consists of a high-precision voltage refer- ence, an error correction circuit, and a current limnited output driver. They are available with several fixed out-put voltages ranging from 1.8V to 5.0V. CMOS technol-ogy ensures low dropout voltage and low current consumption. Although designed primarily as fixed volt-age regulators, these devices can be used with external components to generate variable voltages and currents.
Features
UItra low quiescent current: 4μA (typ.)
High input voltage (up to 12V)
Output voltage:1.8V, 2.5V, 2.7V, 3.0V, 3.3V, 3.5V, 5.0V
Output voltage accuracy: tolerance +3%
Maximum output current: 250mA
Low dropout voltage
Low temperature coefficient
package：TO-92, SOT-89-3 SOT23-3
Application
Battery-powered equipment
Voltage regulator for microprocessor
Voltage regulator for L AN cards
Wireless Communication equipment
Audio/Video equipment
LY76XX serieslow-dropoutlinear voltage regulators with a built-in voltage reference module, error correction module and phase compensation module. LY76XX series are based on the CMOS process and allow high voltage input with low quiescent current. This series can deliver 100mA output current and allow an input voltage as high as 40V.This series has the function of internal feedback resistor setting from 2.1Vto 12V. The output accuracy is t 2%.
Features
High output accuracy:土2%
Input voltage: up to 40 V
Output voltage: 2.1V ~ 12V
Utralow quiescent current (Typ.=3μA) Output Current: lour= 100mA
(When VIN = 5.5V and Vout =3.3V)Low temperature cofficient
Ceramic capacitor can be used
Package: SOT89-3. T092、SOT23-3
Typical Application
Electronic weighbridge
SCM
Phones, cordless phones
Security Products
Water meters, power meters
