- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | WANG Yao, CHEN Ling, YANG Dexin, XU Limei. Cross Regulation Analysis of I2-Controlled Single-Inductor Dual-Output Buck LED Driver[J]. Journal of Southwest Jiaotong University, 2023, 58(6): 1248-1256. doi: 10.3969/j.issn.0258-2724.20220383
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The single-inductor dual-output (SIDO) Buck LED driver has two output branches, namely LED1 and LED2. Between these two output branches, there is cross regulation. In order to reduce the output cross regulation of a SIDO Buck LED driver operating in continuous conduction mode (CCM) of the inductive current, the current-current (I2)-controlled SIDO Buck LED driver was proposed. The operating principle and switch modes of the SIDO Buck LED driver were analyzed, and its state space average model and small signal model were established with the state space averaging method. Then, the circuit structure and operating principle of the I2-controlled SIDO Buck LED driver were analyzed. Based on inductive current ripple and output current ripple, the small signal expressions of duty cycle and cross regulation transfer functions were obtained. The Bode plots of the cross regulation transfer functions were employed to analyze the cross regulation compared with the output branches of the voltage-controlled SIDO Buck LED driver. The study results show that when the reference signal of LED1 of the voltage-controlled SIDO Buck LED driver steps down from 1.6 V to 0.8 V and 2.4 V to 1.2 V respectively, the cross regulation between LED1 and LED2 is 0.250 A and 0.365 A, and that of the I2-controlled SIDO Buck LED driver is 0.09 A and 0.115 A. When the reference signal of LED2 steps down from 3.2 V to 1.6 V and 2.4 V to 1.2 V respectively, the cross regulation between LED2 and LED1 is 0.06 A and 0.04 A, and that of I2-controlled SIDO Buck LED driver is 0.03 A and 0.015 A. It illustrates that the cross regulation between output branches of the I2-controlled SIDO Buck LED driver has been reduced compared with that of the voltage-controlled SIDO Buck LED driver.
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