초록 ▼

Circuitry for driving an electrical load (18) and regulating a load current (IL) therethrough includes a multiple output load driving device (20) having an input (26) receiving a gate drive signal (GD) thereat and operable to direct the load current (I.sub.L) therethrough from a collector (28) to ma

Circuitry for driving an electrical load (18) and regulating a load current (IL) therethrough includes a multiple output load driving device (20) having an input (26) receiving a gate drive signal (GD) thereat and operable to direct the load current (I.sub.L) therethrough from a collector (28) to main (22) and sense (24) outputs thereof. A control circuit is provided including an error amplifier (52) having a non-inverting input operable to receive a reference voltage and an inverting input operable to receive a sense voltage proportional to the portion of load current (I.sub.L) flowing through the sense output (24) of the load driving device (20), and producing an output based thereon to which a gate drive control circuit (54) is responsive to supply the gate drive signal (GD). A feedback capacitor (CFB) is disposed between the collector (28) of the load driving device (20) and a resistor string (R8, R9, RTRIM) establishing the reference voltage, and provides an AC coupling therebetween. This AC coupling compensates for oscillations in the load current (I.sub.L) during load current regulation operation and therefore provides for a stable load current (I.sub.L) during such operation. In accordance with another aspect of the present invention, the feedback capacitor (CFB) is advantageously formed with an IGBT (20) on a single monolithic integrated circuit.

대표청구항 ▼

[What is claimed is:] [1.]a load driving device having a first input responsive to a control signal to conduct a first portion of a load current from a second input to a first output thereof and to conduct a remaining portion of said load current from said second input to a second output thereof;mea

[What is claimed is:] [1.]a load driving device having a first input responsive to a control signal to conduct a first portion of a load current from a second input to a first output thereof and to conduct a remaining portion of said load current from said second input to a second output thereof;means for sensing said first portion of said load current and producing a sense signal corresponding thereto;means for generating a reference signal;a control circuit responsive to said sense and reference signals to provide said control signal at a first signal level when said sense signal is below said reference signal and to reduce said control signal to a load current regulating level as said sense signal approaches said reference signal, said load driving device responsive to said load current regulating level of said control signal to limit said load current therethrough to a regulated current level; anda feedback path establishing a feedback signal between said second input of said load driving device and said means for generating a reference signal, said feedback signal modulating said reference signal to maintain a substantially constant ratio of said first portion of said load current to said load current when said load driving device limits said load current to said regulated current level.