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A8434EESTR-T Datasheet(PDF) 10 Page - Allegro MicroSystems |
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A8434EESTR-T Datasheet(HTML) 10 Page - Allegro MicroSystems |
10 / 11 page 6-Channel High Efficiency Charge Pump White LED Driver A8434 10 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com Figure 7. LED disable subcircuit. Subcircuit for one LEDx pin shown. A similar block is connected to each LEDx pin. + – + – VBATT A8434 CIN COUT D1 D2 D3 D4 D6 D5 LED1 VOUT 1×, 1.5×, 2× Charge Pump VIN VIN – 0.4 VOUT – 0.4 Current Sink LED Disable Block One of six blocks Overvoltage Protection The A8434 is protected up to 4.9 V supply voltage, against accidental overvoltage caused by an open LED. When any LED opens, VOUT will increase till 6 V. Remaining LEDs will continue to function normally. Normal operation will be resumed when the fault is removed. LED Disconnection Every LEDx pin has a disable subcircuit, as shown in figure 7. The A8434 compares the voltage on each LED pin, and if the voltage on the pin is greater than either VOUT – 0.4 V or VIN – 0.4 V, then the corresponding LED pin is disabled. If any WLED is not used, connect the corresponding pin to VOUT. Never leave open any unused WLED pin. LED pins will sink 20 μA typical when connected to VOUT and the correspond- ing LED group (main or sub) is enabled. Note: In shutdown mode (ENM = ENS = 0 V for > 0.5 ms), the total leakage current is < 1μA. Thermal Shutdown The IC is internally protected against overtemperature. The overtemperature limit is set to 165°C nominal. The IC shuts down when the junction temperature exceeds 165°C and automatically turns on again when the IC cools. Component Selection Ceramic capacitors with X5R or X7R dielectric are recom- mended for the input capacitor, CIN, the output capacitor, COUT, and the charge pump capacitors, C1 and C2. |
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