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CAT3604 Datasheet(PDF) 5 Page - ON Semiconductor |
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CAT3604 Datasheet(HTML) 5 Page - ON Semiconductor |
5 / 11 page CAT3604 http://onsemi.com 5 Basic Operation At power-up, the CAT3604 starts operation in 1x mode. If it is able to drive the programmed LED current, it continues in 1x mode. If the battery voltage drops to a level where the LED current cannot be met, the driver automatically switches into 1.5x mode. The 1.5x charge pump will boost the output voltage accordingly to achieve the nominal LED current. The operating mode is reinitialized each and every time the chip is powered up or is taken out of shutdown mode (via EN pin). The use of the control pins (CTR0, CTR1, CTR2) does not reconfigure the mode of operation. LED Current Setting The LED current is set by the external resistor RSET connected between the RSET pin and ground. Table 5 lists various LED currents and the associated RSET resistor value for standard 1% precision surface mount resistors. The digital control lines CTR0, CTR1 and CTR2 allow to turn On or Off a combition of LEDs as shown in Table 6. Short Circuit Detect/Disables The unused LED channels can also be turned off by connecting the respective LED pins to VOUT. In which case, the corresponding LED driver is disabled and the typical LED sink current is only about 20 mA. When the following equation is true on any channel, the driver turns off the LED channel: VOUT * VLED v 1 V (LED channel OFF) Note: The CAT3604 is designed to drive LEDs with forward voltage greater than 1 V and is not compatible with resistive loads. Table 5. RSET Resistor Selection LED Current (mA) RSET (kW) 1 649 2 287 5 102 10 49.9 15 32.4 20 23.7 30 15.4 Table 6. LED Selection Control Lines LED Outputs CTR2 CTR1 CTR0 LED4 LED3 LED2 LED1 0 0 0 – – – ON 0 0 1 – – ON – 0 1 0 – ON – – 0 1 1 ON − – – 1 0 0 – – ON ON 1 0 1 – ON ON ON 1 1 0 ON ON ON ON 1 1 1 – – – – NOTE: 1 = logic high (or VIN) 0 = logic low (or GND) – = LED output OFF |
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