Features: ` High-Voltage CMOS Process with Excellent ESD protection
` Very Low Startup Current (< 35A)
` Current Mode Control
` Non-audible-noise Green Mode Control
` UVLO (Under Voltage Lockout)
` LEB (Leading-Edge Blanking) on CS Pin
` Internal Slope Compensation
` Programmable Line Compensation
` OVP (Over Voltage Protection)
` OLP (Over Load Protection)
` OTP (Over Temperature Protection) through a NTC
` Brownout Protection
` Flexibility on Latch/Auto-Recoverable Protection Mode
` 500mA Driving Capability
Application· Switching AC/DC Adaptor and Battery Charger
· Open Frame Switching Power Supply
· LCD Monitor/TV PowerPinout
SpecificationsSupply Voltage VCC........................... 30V
COMP, CS, (-) LATCH ........................-0.3 ~7V
OVP, BNO.............................. -0.3 ~5V
Junction Temperature ........................150°C
Operating Ambient Temperature ..............-40°C to 85°C
Storage Temperature Range................ -65°C to 150°C
Package Thermal Resistance (SOP-8) ...............160°C/W
Package Thermal Resistance (DIP-8)............. .. 100°C/W
Power Dissipation (SOP-8, at Ambient Temperature = 85°C).... 400mW
Power Dissipation (DIP-8, at Ambient Temperature = 85°C) .. ..650mW
Lead temperature (Soldering, 10sec) .................260°C
ESD Voltage Protection, Human Body Model................3KV
ESD Voltage Protection, Machine Model..................200V
Gate Output Current ............. ... ..........500mA
DescriptionThe LD7522 is a low startup current, current mode PWM controller with green-mode power-saving operation. The SOP-8/DIP-8 package integrated functions such as the leading- edge blanking of the current sensing, internal slope compensation, line compensation, and several protection features. The protection functions include cycle-by-cycle current limit, OVP, OTP, OLP, and brownout protection. It provides the users a high efficiency, low external component counts solution for AC/DC power applications.
Furthermore, to satisfy various protection requirements, both latch-mode protection and auto-recoverable protection can be easily achieved by configuring LD7522 on different operation modes.
The special green-mode control is not only to achieve the low power consumption but also to offer a non-audible-noise operation when the LD7522 is operating under light load or no load condition.
LD7522 Data Sheet
