Method and apparatus for trimming current limit and frequency to maintain a constant maximum power
First Claim
1. A power supply regulator, comprising:
- a power switch coupled between first and second terminals;
a control circuit coupled to the power switch;
an oscillator coupled to provide the control circuit an oscillating signal, the control circuit to switch the power switch in response to the oscillating signal;
a current limit circuit coupled to the power switch and the control circuit to limit a current through the power switch; and
trim circuitry coupled to the oscillator and the current limit circuit, the trim circuitry to be trimmed during manufacture of the power supply regulator to determine a maximum deliverable power value of a power supply such that the maximum deliverable power of the power supply regulator is substantially constant with a maximum deliverable power of another power supply regulator.
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Abstract
Methods and apparatuses to trim current limit (Ip) and frequency (f) to maintain a constant maximum power. In one aspect of the invention, a power supply regulator having a peak current limit detection threshold and an operating frequency is disclosed. The peak current limit threshold or the operating frequency are adjusted specifically to maintain the Ipm·fn product substantially constant from one power supply controller to another where m is substantially equal to 2 and n is substantially equal to 1. In another aspect of the invention, the power supply regulator has a control circuit having a control threshold current. The peak current limit threshold or the operating frequency are adjusted specifically to maintain the product of Ipm·fn divided by the control threshold current substantially constant from one power supply controller to another where m is substantially equal to 2 and n is substantially equal to 1.
34 Citations
6 Claims
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1. A power supply regulator, comprising:
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a power switch coupled between first and second terminals;
a control circuit coupled to the power switch;
an oscillator coupled to provide the control circuit an oscillating signal, the control circuit to switch the power switch in response to the oscillating signal;
a current limit circuit coupled to the power switch and the control circuit to limit a current through the power switch; and
trim circuitry coupled to the oscillator and the current limit circuit, the trim circuitry to be trimmed during manufacture of the power supply regulator to determine a maximum deliverable power value of a power supply such that the maximum deliverable power of the power supply regulator is substantially constant with a maximum deliverable power of another power supply regulator. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification