Part Number: FAN6862, FAN6862TY, FAN6862NY
Function: Green-Mode PWM Controller
Package: SSOT-6, DIP 8 Pin Type
Manufacturer: Fairchildsemi
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Description
This FAN6862 is Highly Integrated Green-Mode PWM Controller.
A highly integrated PWM controller, FAN6862 provides several features to enhance the performance of flyback converters. To minimize standby power consumption, a proprietary green-mode function provides off-time modulation to continuously decrease the switching frequency under light-load conditions. Under zero-load conditions, the power supply enters burst-mode, which completely shuts off PWM output. Output restarts just before the supply voltage drops below the UVLO lower limit. This green-mode function enables power supplies to meet international power conservation requirements.
The FAN6862 is designed for SMPS and integrates a frequency-hopping function that helps reduce EMI emission of a power supply with minimum line filters. The built-in synchronized slope compensation is proprietary sawtooth compensation for constant output power limit over universal AC input range. The gate output is clamped at 18V to protect the external MOSFET from over-voltage damage.
Other protection functions include VDD over-voltage protection and over-temperature protection. For over-temperature protection, an external NTC thermistor can be applied to sense the ambient temperature. When VDD OVP or OTP is activated, an internal latch circuit latches off the controller.
Block Diagram :
Features
1. Low Startup Current: 8μA
2. Low Operating Current in Green Mode: 3mA
3. Peak-Current Mode Operation with Cycle-by-Cycle Current Limiting
4. PWM Frequency Continuously Decreasing with Burst Mode at Light Loads
5. VDD Over-Voltage Protection (OVP)
6. Constant Output Power Limit (Full AC Input Range)
7. Internal Latch Circuit for OVP, OTP
FAN6862 Datasheet
