DC TO DC BUCK CONVERTING CONTROLLER WITH PROGRAMMABLE ON-TIME PERIOD UNIT

• US 20140103896A1
• Filed: 12/18/2013
• Published: 04/17/2014
• Est. Priority Date: 04/21/2011
• Status: Active Grant

• Current Assignee: Green Solution Technology Co., Ltd.
• Original Assignee: Green Solution Technology Co., Ltd.
• Inventors: Lee, Li-Min, Yu, Chung-Che, Shiu, Shian-Sung, Shao, Chao, Gan, Quan
• Granted Patent: US 9,293,989 B2
• Time in Patent Office: Days
• US Class Current: 323/282
• CPC Class Codes: H02M 1/0022 the disturbance parameters being input voltage fluctuations
• CPC Class Codes: H02M 1/0025 Arrangements for modifying reference values, feedback values or error values in the control loop of a converter
• CPC Class Codes: H02M 3/156 with automatic control of output voltage or current, e.g. switching regulators
• CPC Class Codes: H02M 3/158 including plural semiconductor devices as final control devices for a single load
• CPC Class Codes: H02M 3/1588 comprising at least one synchronous rectifier element H02M3/1582, H02M3/1584 take precedence
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A programmable on-time period of a DC to DC buck converting controller is adjusted according to a level of a preset output voltage or a reference signal. Therefore, the DC to DC buck converting controller of the present invention is suitable for any applications with different requests of output voltages or different operating mode.

Claims

1. A DC to DC buck converting controller, packaged in a package and adapted to control a DC to DC buck converting circuit which converts an input voltage into an output voltage, the DC to DC buck converting controller comprising:

a feedback circuit, receiving a reference signal through a pin of the package and generating a feedback control signal according to the reference signal representative of a reference voltage and a feedback signal representative of the output voltage; and

a driving circuit, generating at least one control signal to control the DC to DC buck converting circuit according to the feedback control signal, and the driving circuit comprising an on-time period circuit which sets an on-time period of the DC to DC buck converting circuit according to the level of the reference voltage.

2. The DC to DC buck converting controller according to claim 1, wherein the on-time period circuit comprises a current source, a period capacitance and a comparator and the current source supplies a charging current to charge the period capacitance, and the current value of the charging current is set according to the input voltage and the comparator sets the on-time period according to a voltage of the period capacitance and the reference voltage.

3. The DC to DC buck converting controller according to claim 1, further comprising a digital to analog converter, which generates the reference voltage in response to the reference signal.

4. The DC to DC buck converting controller according to claim 1, wherein the driving circuit further comprises an anti-noise circuit coupled between the feedback circuit and the on-time period circuit, and the anti-noise circuit generates a trigger signal to the on-time period circuit when the feedback control signal is generated for an anti-noise time, which is modulated in response to the reference voltage.

5. The DC to DC buck converting controller according to claim 4, wherein a generated timing of the trigger signal is later than that of the feedback control signal in response to the anti-noise time.

6. The DC to DC buck converting controller according to claim 4, wherein the anti-noise circuit comprises a delay capacitance and a comparator, the delay capacitance is charged and discharged in response to the feedback control signal and the comparator generates the trigger signal according to the reference voltage and a voltage of the delay capacitance.

7. The DC to DC buck converting controller according to claim 1, further comprising a reference voltage generating circuit which generates a reference base voltage, wherein the reference signal is generated according to the reference base voltage by a voltage divider.

8. The DC to DC buck converting controller according to claim 2, wherein the feedback circuit comprises a comparator which generates the feedback control signal according to the reference voltage and the feedback signal, and the on-time period circuit further comprises a discharging unit which determines a discharging timing of the period capacitance according to a comparison result of the comparator and the feedback control signal.