Home > Basic Circuits >Basic Practical Circuits > DC/DC Converter Control Circuit

DC/DC Converter Control Circuit

Source: InternetPublisher:拳制龙 Keywords: DC/DC Converter Updated: 2024/07/18

Overview

MC34063 is a monolithic DC/DC conversion control circuit that contains the main functions required by DC to DC converters. These functions include: a reference voltage source with temperature compensation, a comparator, a duty cycle controllable oscillator with excitation current limit, a driver, and a high current output switch. The circuit is designed for buck, boost, and inverter applications, with few peripheral components.

Features

3.0～40V input working voltage Low standby current Current limit Output switch current 1.5A 100KHz working frequency Reference accuracy 2% Package form: DIP8

Block Diagram and Pin Functions

MC34063 Block Diagram

Pin number	symbol	Function	Pin number	symbol	Function
1	CSW	Switch Collector	5	INCOM	Comparator inverting input
2	ESW	Switch Emitter	6	VCC	power supply
3	GT	Timing capacitors	7	Ipk	Current Limit Sensing
4	GND	land	8	CDR	Driver Collector

Limit parameters (Tamb=25℃)

parameter	symbol	Numeric	unit
voltage	Vcc	40	V
Comparator Input Supply Range	Vi(comp)	-0.3～+40	V
Switch collector voltage	Vc(sw)	40	V
Switch emitter voltage	Ve(sw)	40	V
Switch C-E Voltage	Vce(sw)	40	V
Driver collector voltage	Vc(dr)	40	V
Driver collector current	Ic	-55～100	mA
Switching current	I	1.5	A
Power consumption	PD	1.25	W
Operating Junction Temperature	Tj	150	℃
Working temperature	Tamb	0～70	℃
Storage temperature	Tsj	-65～150	℃

Electrical Characteristics (Unless otherwise specified, Tamb=25℃, Vcc=5V)

parameter name	symbol	Test Conditions	Minimum	typical	maximum	unit
Oscillator
frequency	f	Vpin=0V, CT=1.0	twenty four	33	42	kHz
recharging current	Ichq	Vpin5=5～ 40V	twenty four	35	42	μA
Discharge current	Idischg	Vpin5=5～ 40V	140	190	260	μA
Ratio of discharge and charge current	K	V7=Vcc	5.2	6.1	7.5
Current Limit Sense Voltage	VIPK		250	300	350	mV
Output switch
Saturation voltage	Vce(sat)	Darlington connection Isw=1.0A Pin1 to Pin8		1.0	1.3	V
Saturation voltage	Vce(sat)	Isw=1.0A Rpin8=82Ω		0.45	0.7	V

DC voltage gain	HkDJ	Isw=1.0A, Vce=5.0V	50	120
Collector OFF state current	Ic(off)	Vce=40.0V		0.01	100	μA
Threshold voltage	Vth	Tamb=25℃	1.225	1.25	1.275	V
Threshold voltage	Vth	Tamb=0℃～70℃	1.21		1.29	V
Threshold Voltage Line Regulation	Reg	Vcc=3.0～40V		1.4	5.0	mV
Input bias current	IIB	Vin=0V		-40	-400	nA

Typical application circuit

Boost circuit:

MC34063 boost circuit

Buck circuit:

MC34063 step-down circuit

Voltage Inversion Circuit:

MC34063 voltage inversion circuit

拳制龙

Latest Basic Circuits Circuits

Popular Circuits

Popular Components