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CAT4003BSD-GT3 Datasheet(PDF) 4 Page - ON Semiconductor |
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CAT4003BSD-GT3 Datasheet(HTML) 4 Page - ON Semiconductor |
4 / 12 page CAT4003B, CAT4004B http://onsemi.com 4 Table 4. ELECTRICAL OPERATING CHARACTERISTICS (over recommended operating conditions unless specified otherwise) (VIN = 4.0 V, EN = High, TAMB = 25°C) (Note 6) Parameter Conditions Symbol Min Typ Max Units Quiescent Current ILED = 25 mA/channel IQ 0.5 0.7 1.5 mA Shutdown Current VEN = 0 V IQSHDN 1 mA Full Scale LED Current (Average) (Note 5) ILED−FULL 24 25 26 mA LED Channel Matching ILED * ILEDAVG ILEDAVG ILED−DEV −5 ±1 +5 % Dropout Voltage ILED = 20 mA ILED = 1 mA VDOUT 75 45 mV EN/DIM Pin − Internal pull−down resistor − Logic High Level − Logic Low Level REN/DIM VHI VLO 1.3 200 0.4 kW V V Thermal Shutdown TSD 150 °C Thermal Hysteresis THYS 20 °C Undervoltage lockout (UVLO) threshold VUVLO 2.0 V 5. For the CAT4003B, ILEDAVG = (ILED,CH1 + ILED,CH2 + ILED,CH3) / 3 6. The Min/Max limits apply across the −40°C to +85°C ambient temperature range and are assured by design, characterization and correlation with statistical analysis. Table 5. RECOMMENDED EN/DIM TIMING (For 3 V ≤ VIN ≤ 5.5 V, over full ambient temperature range −40°C to +85°C.) (Note 7) Parameter Conditions Symbol Min Typ Max Units Power−up Setup Time TSETUP 10 ms EN/DIM program low time TLO 0.2 500 ms EN/DIM program high time THI 0.2 ms LED current settling time TLED 10 ms EN/DIM low time to shutdown TPWRDWN 2 3 5 ms 7. The Min/Max limits apply across the −40°C to +85°C ambient temperature range and are assured by design, characterization and correlation with statistical analysis. Figure 1. CAT400XB EN/DIM Dimming Timing Diagram 100% EN/DIM LED Current Shutdown Shutdown 97% 94% 3% 0% 100% 32 Levels TLED TSETUP TPWRDWN THI TLO LED Current Setting On the CAT400XB, the full scale LED current is internally set to 25 mA (no external resistor). When the EN/DIM is first enabled, the CAT400XB sets the LED channel current to the full scale current. Each consecutive rising edge on the EN/DIM decreases the LED current by one step until it goes to zero, as shown on Figure 1. |
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