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FAN6300A/H — Highly Integrated Quasi-Resonant Current Mode PWM Controller
January 2014
FAN6300A / FAN6300H
Highly Integrated Quasi-Resonant Current Mode
PWM Controller
Features
High-Voltage Startup
Quasi-Resonant Operation
Cycle-by-Cycle Current Limiting
Peak-Current-Mode Control
Leading-Edge Blanking (LEB)
Internal Minimum t
OFF
Internal 5 ms Soft-Start
Over Power Compensation
GATE Output Maximum Voltage
Auto-Recovery Over-Current Protection(FB Pin)
Auto-Recovery Open-Loop Protection(FB Pin)
VDD Pin and Output Voltage (DET Pin)
OVP Latched
Low Frequency Operation (below 100 kHz) for
FAN6300A
High Frequency Operation (up to 190 kHz) for
FAN6300H
Description
The highly integrated FAN6300A/H of PWM controller
provides several features to enhance the performance
of flyback converters. FAN6300A is applied on quasi-
resonant flyback converters where maximum operating
frequency is below 100 kHz. FAN6300H is suitable for
high-frequency operation (up to 190 kHz). A built-in HV
startup circuit can provide more startup current to
reduce the startup time of the controller. Once the V
DD
voltage exceeds the turn-on threshold voltage, the HV
startup function is disabled immediately to reduce power
consumption. An internal valley voltage detector
ensures power system operates at quasi-resonant
operation over a wide-range of line voltage and any load
conditions, as well as reducing switching loss to
minimize switching voltage on drain of power MOSFET.
To minimize standby power consumption and light-load
efficiency, a proprietary green-mode function provides
off-time modulation to decrease switching frequency
and perform extended valley voltage switching to keep
to a minimum switching voltage. The operating
frequency is limited by minimum t
off
time, which is 38 µs
to 8 µs in FAN6300A and 13 µs to 3 µs in FAN6300H,
so FAN6300H can operate at higher switching
frequency than FAN6300A.
FAN6300A/H controller also provides many protection
functions. Pulse-by-pulse current limiting ensures the
fixed-peak current limit level, even when a short circuit
occurs. Once an open-circuit failure occurs in the
feedback loop, the internal protection circuit disables
PWM output immediately. As long as V
DD
drops below the
turn-off threshold voltage, the controller also disables
PWM output. The gate output is clamped at 18 V to
protect the power MOS from high gate-source voltage
conditions. The minimum t
OFF
time limit prevents the
system frequency from being too high. If the DET pin
triggers OVP, internal OTP is triggered and the power
system enters latch-mode until AC power is removed.
The FAN6300A/H controller is available in the 8-pin
Small Outline Package (SOP).
Applications
AC/DC NB Adapters
Open-Frame SMPS
Ordering Information
Part Number
FAN6300AMY
FAN6300HMY
Operating Temperature Range
-40°C to +125°C
Package
8-Lead, Small Outline Package (SOP)
Packing Method
Tape & Reel
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