Digital camera-DV machine power supply circuit

Digital camera-DV machine power supply circuit

Shown is the power supply circuit of a digital camera/DV machine , which uses the MAX1800 chip as the control core. As can be seen from the picture, digital cameras are all powered by batteries. The voltage is low (0.7~5.5 V). However, the circuits in digital cameras often require higher voltages, such as +18 V, +15 V, +12 V, etc. For this purpose, the digital camera uses the MAX1800 LiJ chip to generate PWM signals, and uses a boost method to pass the switching pulses through two switching transformers (TI, T2) to output +18V, +15V, +12V, -7.5V, and also output +1.8V and 3.3V DC voltages. At the same time, it is recommended to output +5 V voltage through IC2.