电源IC848F09，848E22，848E36，580E系列现货热卖
2011-08-16
脉宽调变控制器,用于LED电源电路。低成本，PWM和PFM和CRM,启动电流低（约10A）Z低工作电流（约2mA）于电流模式操作,欠压锁定,可编程的PWM,兼容SG5701及SG5848与LD7535及OB22632/63有需要联系13534212799
Features
z Low Cost, PWM&PFM&CRM
z Low Start-up Current (about 10μA) z Low Operating Current (about 2mA) z Current Mode Operation
z Under Voltage Lockout (UVLO)
z Built-in Synchronized Slope
Compensation
z Programmable PWM Frequency
z Leading edge Blanking on Sense input
z Constant output power limiting for
universal AC input
z Cycle-by-cycle current limiting
z Clamped gate output voltage 16.5V
z Over voltage protect 26.7V
z High-Voltage CMOS Process with ESD
z SOT-23-6L♀°SOP-8 & DIP-8 Pb-Free
Packaging
z Compatible with SG5701 & SG5848 & LD7535 &OB22632/63
Applications
z Switching AC/DC Adaptor
z Battery Charger
z Open Frame Switching Power Supply
z 384X Replacement
General Description
The TA848 is a highly integrated low cost current mode PWM controller, which is ideal for small power current mode of offline AC-DC fly-back converter applications. Making use of external resistors, the IC changes the operating frequency and automatically enters the PFM/CRM under light-load/zero-load conditions. This can minimize standby power consumption and achieve green-power functions. With a very low start-up current, the TA848 could use
a large value start-up resistor (1.5Mohm). Built-in synchronized slope compensation enhances the stability of the system and avoids sub-harmonic oscillation. Dynamic peak limiting circuit minimizes output power change caused by delay time of the system over a universal AC input range. Leading
edge blanking circuit on current sense input could remove the signal glitch due to snubber circuit diode reverse recovery and thus greatly reduces the external component count and system cost in the design. Pulse-by-pulse current limiting ensures safe operation even during short-circuit.
The TA848 offers more protection like OVP (Over Voltage Protection) and OCP (Over current protection). The TA848’s output driver is clamped to maximum 16.5V to protect the power MOSFET. Excellent EMI performance is achieved soft switching control at the totem pole gate driver output. TA848 is offered in SOT-23-6, SOP-8 and DIP-8 packages.
