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TK11850L Datasheet(PDF) 10 Page - TOKO, Inc |
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TK11850L Datasheet(HTML) 10 Page - TOKO, Inc |
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10 / 14 page  Page 10 May 2001 TOKO, Inc. TK11850L DIMMING R D E L ( 9)I D E L ) A m ( 4 29 . 1 2 7 25 . 9 1 6 36 . 4 1 1 54 . 0 1 0 0 14 . 5 0 1 51 . 1 The following are 3 kinds of dimming methods. 1. Dimming by R LED The current of the LED (I LED) is determined by RLED,which can be set by switches such as transistors. Example of 3 LEDs with a 4 brightness level circuit: I LED vs. RLED LED CURRENT (ILED) vs. TOTAL RESISTANCE (RLED) RLED (Ω) 0 10 100 1000 16 12 8 20 18 14 10 6 4 2 IS EXT VIN OSC Cx CLK 0.86 V 0.3 V CLK VREF 0.525 V ERROR COMP IS COMP 0.1 V CX RLED2 ON/OFF RSC GND VIN ILED VLED COUT VOUT GND 7 CX 8 EN VFB + - + - RLED3 RLED1 CONTROL SIGNAL 1 CONTROL SIGNAL 2 D L CIN CLK S R Q BAND GAP REFERENCE SW2 SW1 I LED = R LED: Total value of Resistors V REF = 0.525 V (typ) V FB Voltage = 0.525 V (typ) V REF R LED |
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