SD2104A是一款高效率型高亮度LED灯恒流驱动芯片。内置功率MOS管，尤其适合12~85V宽输入电压范围的LED 驱动。SD2104A采用固定关断时间的峰值电流控制方式，其工作频率高可达1MHz，可使外部电感和滤波电容体积减小，效率提高，节省PCB面积。可通过外部RC电容进行调节工作频率也可根据用户要求进行调节。在EN端加PWM信号，可调节LED 灯的亮度。FB端可设定线性调光。SD2104A通过调节外置电流检测电阻的阻值来设置流过LED灯的电流，从而设置LED灯的亮度，流过LED灯的电流可从几十毫安到850毫安变化。(散热面积大)SD2104A采用ESOP-8/PP封装。散热片内置接SW脚。
特点
Ø 内置100V 功率管
Ø 宽输入电压范围：12V-85V
Ø 高效率：可高达92%
Ø 大工作频率:1MHz
Ø 峰值电流采样电压:250mV
Ø 亮度可调：EN端加PWM信号
Ø 关断时间可调RC电容设定开关频率
Ø 内置电流采样前沿消隐电路
Ø 线性可调:FB端
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
