REF3WIOTCOOLSETTOBO1: 5 V, 3 W, 1 Isolated Output, Offline Flyback Power Supply

In this application, an Infineon ICE3RBR4765JG from the CoolSET™ jitter series is used as a flyback controller. The controller has a built-in 650 V CoolMOS™ as the main switching component, as well as the startup cell. The reference design board operates in Discontinuous Conduction Mode (DCM), running at 65 kHz switching frequency. The output is a single 5 V / 600 mA, generated by secondary side regulation. Active Burst Mode (ABM) operation provides very low standby power consumption (less than 13 mW over input voltage range 180 Vac ~ 265Vac). Low EMI is achieved by built-in frequency jitter and soft start operation.

Key features of this application are the circuit simplicity, very small form factor and very low no-load power consumption, with regard to the performance and stable operation in all conditions. In order to fit into a very small form factor, the larger components are selected based on a maximum height as well as having the smallest PCB footprint. The very low power consumption with no-load is achieved by addressing critical components that continuously draw power, as well as the controller power consumption that depends significantly on its supply voltage.

Features:

• 650 V avalanche rugged CoolMOS™ with built-in Startup Cell

• Active Burst Mode for lowest Standby Power

• Fast load jump response in Active Burst Mode

• 65 kHz internally fixed switching frequency

• Auto Restart Protection for Over load, Open Loop, VCC Under voltage & Over voltage and Over temperature

• Built-in Soft Start

• Built-in blanking window with extendable blanking time for short duration high current

• External auto-restart enable pin

• Maximum Duty Cycle 75%

• Overall tolerance of Current Limiting < ±5%

• Internal PWM Leading Edge Blanking

• BiCMOS technology for low power consumption and wide VCC voltage range

• Built-in Frequency jitter and Soft gate drive for low EMI