FAN301U – PWM Controller

Part Number : FAN301, FAN301U

Function : PWM Controller

Manufactures : Fairchild Semiconductor

Images :

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Description :

FAN301 — PWM Controller for Low Standby Power Charger Applications July 2010 FAN301 PWM Controller for Low Standby Power Charger Applications Features ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ ƒ Ultra-Low Standby Power Under 20mW at 264VAC Constant-Current (CC) Control without SecondaryFeedback Circuitry Green Mode: PWM Frequency Linearly Decreasing Fixed PWM Frequency at 45kHz with Frequency Hopping to Solve EMI Problems High-Voltage Startup Low Operating Current: 3mA Peak-Current-Mode Control in CV Mode Cycle-by-Cycle Current Limiting VDD Over-Voltage Protection (Auto-Restart) VDD Under-Voltage Lockout (UVLO) Gate Output Maximum Voltage Clamped at 15V Fixed Over-Temperature Protection (Auto-Restart) Description This highly integrated PWM controller, FAN301, provides features to enhance the performance of lowpower flyback converters. The proprietary topology enables simplified circuit design for battery charger applications. A low-cost, smaller, and lighter charger is the result, compared to a conventional design or a linear transformer. To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to linearly decrease PWM frequency under light-load conditions. This green mode assists the power supply in meeting power conservation requirements. By using FAN301, a charger can be implemented with fewer external components and minimized cost. A typical output CV/CC characteristic envelope is shown in Figure 1. Vo Maximum Typical Minimum Applications ƒ ƒ Battery chargers for cellular phones, cordless phones, PDA, digital cameras, power tools Replaces linear transformer and RCC SMPS Io Figure 1. Typical Output V-I Characteristic (without Cable) Ordering Information Part Number FAN301MY Operating Temperature Range -40°C to +105°C Package 8-Lead, Small Outline Package Packing Method Tape & Reel © 2008 Fairchild Semiconductor Corporation FAN301 • Rev. 1.0.0 www.fairchildsemi.com FAN301 — PWM Controller for Low Standby Power Charger Applications Application Diagram Figure 2. Typical Application Internal Block Diagram Figure 3. Functional Block Diagram © 2008 Fairchild Semiconductor Corporation FAN301 • Rev. 1.0.0 www.fairchildsemi.com 2 FAN301 — PWM Controller for Low Standby Power Charger Applications Marking Information F- Fairchild Logo Z: Assembly Plant Code X: Year Code Y: Week Code TT: Die-Run Code T: M=SOP P: Y= Green Package M: Manufacture Flow Code Figure 4. Top Mark Pin Configuration CS GATE VDD VS HV NC FB GND Figure 5. Pin Configuration Pin Definitions Pin # 1 2 3 4 5 6 7 8 Name CS GATE VDD VS GND FB NC HV Description Current sense. Connected to a current-sense resistor for peak-current-mode control in CV mode. The current-sense signal is also provided for output-current regulation in CC mode. The totem-pole output driver to drive the power MOSFET. Power supply Feedback. The VS pin provides feedback information for output-current regulation in CC mode. Power ground Fee […]

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FAN301U Datasheet


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