Part Number : FAN301, FAN301U
Function : PWM Controller
Manufactures : Fairchild Semiconductor
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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 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 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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