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DC-DC control circuit with large range of load current

A current range and control circuit technology, which is applied in the field of analog integrated power supply chips, can solve the problems that the circuit cannot be guaranteed to work in PWM mode and the output voltage ripple increases.

Active Publication Date: 2010-06-30
WUXI CHIPOWN MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When it is lower than 100mA, PFM mode is used, and when it is higher than 700mA, the circuit cannot be guaranteed to work in PWM mode, so the output voltage ripple increases

Method used

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  • DC-DC control circuit with large range of load current
  • DC-DC control circuit with large range of load current
  • DC-DC control circuit with large range of load current

Examples

Experimental program
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Embodiment Construction

[0019] The technical scheme of the invention will be described in detail below in conjunction with the drawings:

[0020] in figure 2 In the present invention, a DC-DC control circuit with a large load current range includes a P-type power tube MP and a sampling current tube MP of the P-type power tube. s , Current detection resistor Rsense, N-type power tube MN, inductor L, load R L , Load capacitance C L , Voltage divider resistor R 1 , R 2 , Error amplifier ea, error amplifier detection circuit ea sensor, first comparator comp, resistor R that converts current into voltage 3 , RS flip-flop, buffer circuit buffer1, buffer2, current conversion circuit current convertor, voltage-current conversion circuit VI convertor, summing operator and current detection amplifier amp; the input terminals of the summing operator are respectively connected to the voltage and current conversion circuit VI convertor Output terminal and given sawtooth current I ramp , The output terminal of the su...

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PUM

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Abstract

The invention discloses a DC-DC control circuit with wide range of load current, which comprises a P-type power tube (MP), a sampling circuit tube (MPs) of the P-type power tube, a current sense resistor (Rsense), an N-type power tube (MN), an inductance (L), a load (RL), a load capacitance (CL), divider resistances R1 and R2, an error amplifier (ea), a detection circuit (ea sensor) of the error amplifier, a first comparator (comp), a resistance R3, an RS trigger, buffer circuits (buffer 1 and buffer 2) a current conversion circuit (current convertor), a voltage and current conversion circuit (V-I convertor), a summation arithmetic unit and a current detection amplifier amp, wherein the resistance R3 is used for converting current into voltage. The DC-DC control circuit overcomes the defect of the traditional control circuit and greatly widening the range of the load current.

Description

Technical field [0001] The invention belongs to the technical field of analog integrated power chips, and is a loop control circuit, which can be applied to various control systems such as step-down DC-DC and step-up DC-DC. Background technique [0002] At present, the application of power analog IC is more and more extensive, and its requirements are getting higher and higher. It is required to have the characteristics of high efficiency, low voltage ripple, fast transient response and large load range. [0003] The traditional DC-DC control circuit such as figure 1 As shown, in order to make the output voltage ripple as small as possible, the chip should work in PWM mode, but when the current load range is expanded, such as 100mA~3.6A, the average current of the inductor is in the range of 100mA~3.6A, the maximum The value is 36 times the smallest. Similarly, after the inductor current is sampled proportionally, its maximum value is also 36 times the minimum value. However, afte...

Claims

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Application Information

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IPC IPC(8): H02M3/156H02M1/14G05F1/56
Inventor 谢凌寒张韬
Owner WUXI CHIPOWN MICROELECTRONICS
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