飞兆PWM控制芯片应用案例-原边控制

This highly in tegrated PWM controller, FAN100,
provides several features to enhance the pe rf ormance
of low-power flyb ack converte rs. The proprietary
topology enables simplified circuit design for battery
charger appl ications. A low-cost, smaller, and lighter
charger results when compared to a conven tional
design or a lineartransformer. The startup current is
only 10μA, which allows use of large startup resistance
for further power saving.
To minimize the standby power consumption, the
proprietary green-mode function provides off-time
modulation to linearly decrease PWM frequency under
light-lo adconditions. This green-mode function assists
the power supply meeting the power conservation
requirements.
Using FAN100, a charger canbe implemented with
fewest external components and minimized cost. A
typical output CV/CC characteristic envelope is shown in Figure 1.