PWM DRIVER CIRCUIT
PROBLEM TO BE SOLVED: To improve the versatility of an LED driver circuit regarding a PWM driver circuit. SOLUTION: An LED 34 is connected to a ground through a power transistor 30 and constant-current transistors 46a to 46n. A base for the power transistor 30 is connected to an internal PWM-signal...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | PROBLEM TO BE SOLVED: To improve the versatility of an LED driver circuit regarding a PWM driver circuit. SOLUTION: An LED 34 is connected to a ground through a power transistor 30 and constant-current transistors 46a to 46n. A base for the power transistor 30 is connected to an internal PWM-signal generating circuit 40 or an external PWM-signal input terminal 38 through a changeover switch 36. Accordingly, either of an internal PWM signal or an external PWM signal is selected by the changeover switch 36, and the power transistor 30 can be turned on and off. COPYRIGHT: (C)2007,JPO&INPIT |
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