Boost system and method to facilitate driving a load
AssigneeTexas Instruments Incorporated
InventorIndumini Ranmuthu
Life of this patent
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Abstract
A system and method enable boosting a bias applied to a load so as to facilitate reversing the direction of the bias applied relative to the load. The amount of boosting provided to facilitate reversing the bias polarity, depends on a substantially fixed boost voltage, which can be programmable. Thus, by setting the boost voltage to a predetermined voltage improved performance can be achieved, including, for example, improving the rise and/or fall times of bias current applied to an inductive load.
Claims25
A boosting system to facilitate reversal of current through an associated load, comprising:
- a programmable voltage generator operative to generate a boost voltage based on a programmable input;
- and
- a switch network coupled to the boost voltage and operative to control a boost current supplied relative to the associated load in response to a control signal indicating a reversal of the current through the associated load.
A system to facilitate operation of an inductive write head, comprising:
- an output driver circuit coupled to drive write current in a direction through the inductive write head based on data to be written to a magnetic recording medium;
- and
- a boost system coupled to provide boost current to the inductive write head based on reversing the direction of the write current through the inductive write head, the boost system providing the boost current as a function of a predetermined programmable substantially fixed boost voltage.
A system to facilitate reversal of write current through an associated inductive load, comprising:
- means for programming a substantially fixed boost voltage;
- means for providing a first boost current as a function of the boost voltage and in a first direction relative to the inductive load in response to the write current reversing from a second direction to the first direction through the inductive load;
- and
- means for providing a second boost current as a function of the boost voltage and in the second direction relative to the inductive load in response to the write current reversing from the first direction to the second direction through the inductive load.
A method to facilitate reversing a direction of write current through a write head, comprising:
- in response to reversing direction of the write current through the write head from a first direction to a second direction, boosting the write current in the second direction for a first boost duration based on a programmable, substantially fixed boost voltage;
- after the first boost duration, terminating the boosting of the write current;
- in response to reversing direction of the write current through the write head from the second direction to the first direction, boosting the write current in the first direction for a second boost duration based on the boost voltage;
- and
- after the second boost duration, terminating the boosting of the write current.
Dependencies are inferred from the claim text.