DC-DC converter integrated circuit and application circuit thereof

Abstract

The invention discloses a DC-DC converter integrated circuit. The DC-DC converter integrated circuit comprises an oscillation unit which generates an oscillating pulse signal; a triggering unit which is connected with the oscillation unit and regards the received oscillating pulse signal as one triggering signal; a switch driving unit which is connected with the triggering unit; a comparing unit; and at least a Darlington driving unit. The signal output end of the switch driving unit is led outwards to connect with a voltage output unit; the voltage output unit outputs a driving voltage used for driving a load; a reference voltage signal is arranged in a path of signal input; and the other path of signal input is voltage signals which are sampled from the voltage output unit through a sampling unit; the comparing unit outputs a first electric level signal which serves as another triggering signal of the triggering unit based on the sizes of the two paths of the voltage signals; and the comparing unit is connected with the triggering unit. As a DC-DC converter and a Darlington driver are arranged in the integrated circuit, units of a relay waiting for driving can be directly driven while standby power consumption is reduced, and the DC-DC converter integrated circuit is convenient to use.

Description

technical field [0001] The invention belongs to the field of power conversion, in particular to an integrated circuit with a built-in DC-DC converter and a Darlington drive unit and an application circuit thereof. Background technique [0002] Electric water heaters, gas water heaters, washing machines and electric fans on the market today widely use a power frequency transformer plus 7805 as a power board, which converts 8-30V DC power into 5V DC output through the 7805 stabilized voltage source module to provide the entire Control circuit power supply. see figure 1 , which is a circuit diagram of a power board widely used at present. Among them, the 7805 stabilized voltage source module 100 converts the input DC power supply VCC (the power supply VCC is a DC power supply stepped down by a 220V AC power through a power frequency transformer and rectified to 8V to 30V) into a 5V DC stabilized voltage output. When applied: [0003] 1. Using 7805 as a voltage regulator, the...

AI Technical Summary

Problems solved by technology

[0003] 1. Using 7805 as a voltage regulator, the power conversion efficiency is low;

[0004] 2. The 7805 has severe heat generation and needs to add additional heat sinks, and with the increase of power, the heat generation becomes unacceptable, which can no longer meet the needs of high power output;

[0005] 3. In order to reduce the power consumption of 7805, it is necessary to add R1 current-limiting resistor in the front stage of the input. The power consumption of the current-limiting resistor R1 is high, so a power resistor is required, and the cost is high.

It can be seen that it mainly uses discrete devices to drive relays, which has low integration, complex processing, and high cost.

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