DC-DC power supply

Update date:2018-06-01 Source:MAXGE

DC-DC power supply

1,3V to +5V, +12V circuit diagram

Battery-powered portable electronic products generally use a low power supply voltage, which can reduce the number of batteries to achieve the purpose of reducing the size and weight of the product, so commonly used 3 - 5V as working voltage, in order to ensure the stability and accuracy of the circuit work Requires the use of regulated power supply. If the circuit uses 5V operating voltage, but also requires a higher operating voltage, which often makes the designer difficult. This article describes a circuit using two boost modules to solve this problem, and as long as two battery power supply.

The circuit is characterized by a small number of external components, small size, light weight, output +5 V, +12 V are stable, to meet the requirements of portable electronic products. The +5V power supply can output 60mA and the +12V power supply has a maximum output current of 5mA.

power supply

This circuit is shown above. It consists of AH805 boost module and FP106 boost module. The AH805 is a boost module with an input of 1.2 to 3V and an output of 5V. It can output 100mA at 3V. The FP106 is a SMD boost module with an input of 4 to 6V, a fixed output voltage of 29±1V, and an output current of up to 40mA. Both the AH805 and FP106 are a level-controlled power-off control terminal.

Two 1.5V alkaline batteries output 3V voltage input AH805, AH805 output +5V voltage, one for 5V output, the other input FP106 to produce 28 - 30V voltage, after the regulator regulator output +12V voltage .

As can be seen from the figure, as long as the voltage regulator of the regulator is changed, different output voltages can be obtained and the use is very flexible. The pin 5 of the FP106 is the control power shutdown end. When the power is turned off, the power consumption is almost zero. When the 5th pin is high “2.5V, the power supply is turned on; When the 5th pin is low, it is <0.4V. The power is turned off. It can be controlled by a circuit or manually controlled. If no control is needed, pin 5 is connected to pin 8.

2, using MC34063 do 3.6V power transfer 9V circuit diagram

Work status:

No load:

Input: 3.65V, 18uA (Similar 600mAH battery standby for more than three years)

With load:

Output: 9.88V, 50.2mA, input: 3.65V, 186.7mA, efficiency is 72%

working principle:

When there is no load, IC's 6-pin has no electricity and stops working. The input current of 3.65V is only 18uA (a 600mAH battery is more than three years standby)!

When there is a load (Q1 has Ieb current), the 8550 EC pole is turned on and the IC is powered.

Whether or not the IC is operating is determined by whether there is a load, it is quite a battery.

High voltage conversion efficiency with IC and stable output!

This circuit adds a little bit of improvement, can increase the power and can do "switching 4.2V 5V mobile power". You can use a battery box to do backup power for your phone!

Circuit diagram


My inductance is about 30 turns on a 1cm I-core with a 0.3mm wire. I think this magnetic core is too big for use. His space has not yet reached half.

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