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FAN5608DMPX Fiches technique(PDF) 7 Page - Fairchild Semiconductor |
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FAN5608DMPX Fiches technique(HTML) 7 Page - Fairchild Semiconductor |
7 / 17 page FAN5608 PRODUCT SPECIFICATION REV. 1.0.3 6/28/04 7 PWM Control 1. A is PWM Controlled, B is Low. ILED (Average) = δ x 5mA, where δ is Duty Cycle. (Note 3) 2. A is High and B is PWM. ILED (Average) = 5mA + δ x 15mA, where δ is Duty Cycle. (Note 4) 3. A and B are PWM. ILED (Average) = δ x 20mA, where δ is Duty Cycle. (Note 5) Notes: 3. Proportionally select the duty cycle to achieve a typical LED current between 1mA to 4mA. 4. Maximum PWM frequency can be 30KHz. 5. Proportionally select the duty cycle to achieve a typical LED current between 1mA and 19mA. 1KHz ss ss ss 30% Duty Cycle 1KHz 70% Duty Cycle A Input (PWM) B Input (0) ss OFF ILED 0mA ILED (Average) = 0.3 x 5mA = 1.5mA ILED (Average) = 0.7 x 5mA = 3.5mA B Input (PWM) 1KHz 1KHz ss ss ss ss 30% Duty Cycle 70% Duty Cycle A Input ss OFF ILED 0mA ILED (Average) = 0.7 x 20mA + 0.3 x 5mA = 15.5mA ILED (Average) = 0.3 x 20mA + 0.7 x 5mA = 9.5mA B Input (PWM) A Input (PWM) ss 1KHz 1KHz ss ss ss ss ss 30% Duty Cycle 1KHz 30% Duty Cycle 70% Duty Cycle 1KHz 70% Duty Cycle ss 0mA OFF ILED (Average) = 0.3 x 20mA = 6mA ILED (Average) = 0.7 x 20mA = 14mA ILED |
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