Design of a high-speed high-precision constant current output driver circuit

YUAN Yi-dan; LUO Qian; HE Jiang-ping; WU Ke-jun

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Design of a high-speed high-precision constant current output driver circuit

更新时间：2026-09-04

- Design of a high-speed high-precision constant current output driver circuit
- Vol. 37, Issue 10, Pages: 75-78(2020)
- 作者机构：
  
  1. 电子科技大学成都学院机构,四川,成都,611731
  2. 电子科技大学,四川,成都,611731
  3. 西华大学机构,四川,成都,610039
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2020
- 稿件说明：
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袁艺丹, 罗谦, 贺江平, 吴克军. 一种高速高精度恒流输出驱动电路设计[J]. 微电子学与计算机, 2020, 37(10): 75-78, 86.

YUAN Yi-dan, LUO Qian, HE Jiang-ping, et al. Design of a high-speed high-precision constant current output driver circuit[J]. 2020, 37(10): 75-78.
袁艺丹, 罗谦, 贺江平, 吴克军. 一种高速高精度恒流输出驱动电路设计[J]. 微电子学与计算机, 2020, 37(10): 75-78, 86. DOI：

YUAN Yi-dan, LUO Qian, HE Jiang-ping, et al. Design of a high-speed high-precision constant current output driver circuit[J]. 2020, 37(10): 75-78. DOI：

摘要

设计了一种高速高精度恒流输出驱动电路.该电路通过消除反馈环路失配和增加输出阻抗的方式提高驱动电路输出电流的精度；同时通过减小功率晶体管过驱电压的方式加快输出电流的开启速度.该恒流输出驱动电路基于0.18 μm BCD工艺设计，版图面积约为0.1 mm.通过芯片测试，该恒流输出驱动电路的输出电流为60 mA时，负载电压在0.3~4.5 V范围内输出电流精度为±0.16%；输出电流为120 mA时，负载电压在0.55V~4.5V范围内输出电流精度为±0.12%.输出电流为120 mA时，输出电流开启时间为20 ns.

Abstract

A high-speed and high-precision constant current output drive circuit is designed in this paper. The current precision of the driver circuit is improved by eliminating the mismatch of the feedback loop and increasing the output impedance. The turn-on speed of output current is enhanced by reducing the overdrive voltage of the power transistor. The proposed driver circuit was fabricated in a 0.18 μm BCD process. It occupies only 0.1 mm chip area. The chip tested result show that the current accuracy is ±0.16% when the output current is 60 mA for the output voltage range from 0.3V to 4.5V. While the current accuracy is ±0.12% when the output current is 120 mA for the output voltage range from 0.55V to 4.5 V. The turn-on time is only 20 ns for an output current of 120mA.

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references

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DONG Z X, LI N L, YU Q, et al. Design of a high speed constant current output driver circuit [J]. Microelectronics, 2013, 43(3): 375-378. DOI: 375

LIU Z D, LEE H. A 26W 97%-efficiency fast-settling dimmable LED driver with dual-nMOS-sensing based glitch-tolerant synchronous current control for high-brightness solid-state lighting applications[J]. IEEE Journal of Solid-State Circuits, 2015, 50(9): 2174-2187. DOI: 2174

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