A Novel UVLO Circuit with Current-Mode Control Technique for DC-DC Converters

2013 ◽  
Vol 765-767 ◽  
pp. 2534-2537
Author(s):  
Yun Wu Zhang ◽  
Jing Zhu ◽  
Wei Feng Sun
Keyword(s):  
Threshold Voltage ◽  
Supply Voltage ◽  
Current Mode ◽  
Response Speed ◽  
Fast Response ◽  
Control Technique ◽  
High Threshold ◽  
Current Mode Control ◽  
Mode Control ◽  
Threshold Voltages

A novel Under Voltage Lockout (UVLO) circuit featuring with fast response speed and low temperature coefficient threshold voltages is proposed in this paper. Compared with the conventional structure, the proposed circuit achieves the fast response ability thanks to the current-mode control technique is utilized. Meanwhile, this UVLO realizes hysteretic threshold by a feedback control path to improve the interference rejection capability. In addition, the threshold voltage varies slightly with the variation of the supply voltage and temperature by using a bandgap core. The proposed circuit implemented with 0.5μm BCD technology has an input high threshold voltage of 8.5V and a hysteresis of 1.5V, and start or shut off the power quickly. Test results verified that the proposed UVLO has the qualification to be applied to DC-DC converters.

Single Inductor Bipolar Outputs DC-DC Converter with Current Mode Control Circuit

2013 ◽  
Vol 534 ◽  
pp. 220-226 ◽  
Author(s):  
Nobukazu Takai ◽  
Takashi Okada ◽  
Kenji Takahashi ◽  
Hajime Yokoo ◽  
Shunsuke Miwa ◽  
...  
Keyword(s):  
Power Supply ◽  
Supply Voltage ◽  
Current Mode ◽  
Cmos Process ◽  
Power Supply Voltage ◽  
Negative Power ◽  
Current Mode Control ◽  
Mode Control ◽  
Digital Still Camera ◽  
Simulation Results

Mobile equipment such as organic-EL display, digital still camera and so on re-quire both positive and negative power supply voltage to obtain high quality. Single InductorMultiple-Output (SIMO) DC-DC converter can provide a pair of positive and negative outputvoltages with only one external inductor. This paper describes SIMO DC-DC Converter usingproposed current-mode control (CMC) circuit. The proposed CMC circuit realizes high responsespeed for the change of load current. Spectre simulations with 0.18m CMOS process parameterare performed to verify the validity of the proposed converter. The simulation results indicatethat the proposed converter has higher response time compared with conventional converter.

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