文档介绍：48伏电瓶车充电器原理
Charger principle of 48 volt battery car. Txt
At present, the most widely used and also the earliest singlscillator frequency is limited to 40kHz. If the MOS field effect transistor is driven, the oscillation frequency is set by an external RC circuit, and the operation frequency is up to 500kHz.
Built in over-current protection input (third feet) and error amplification input (first feet), two pulse modulation (PWM) control terminals. The input of the error amplifier constitutes the main pulse width modulation (PWM) control system, and the over current detection input can control the pulses one by one, directly control the pulse width of each cycle, and make the output voltage regulation rate reach 0. 01%/V. If the voltage of the third pin is greater than IV or the voltage of the first pin is less than IV, the PWM comparator outputs the high level so that the latch is reset until the next pulse arrives. If you use the first, third foot level, the control of the external circuit latch open / closed, the latch only once per cycle output trigger pulse, will undoubtedly make the anti-interference performance of the circuit is enhanced, switch not false triggering, the reliability will be improved.
The internal oscillator frequency is set by fourth, eighth pin external resistors and capacitors. At the same time, the internal reference voltage is introduced into the