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ADP1660ACBZ-R7 Fiches technique(PDF) 10 Page - Analog Devices |
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ADP1660ACBZ-R7 Fiches technique(HTML) 10 Page - Analog Devices |
10 / 28 page ADP1660 Data Sheet Rev. 0 | Page 10 of 28 THEORY OF OPERATION The ADP1660 is a high power, I2C programmable, dual white LED driver ideal for driving white LEDs for use as a camera flash. The ADP1660 includes a boost converter and two current regulators suitable for powering two high power white LEDs. WHITE LED DRIVER The ADP1660 drives a synchronous 3 MHz boost converter as required to power the high power LEDs. • If the sum of the LED forward voltage plus the current source headroom voltage is higher than the battery voltage, the boost converter is turned on. • If the battery voltage is higher than the sum of the LED forward voltage plus 2× the current source headroom voltage, the boost converter is disabled and the part operates in pass-through mode. The ADP1660 uses an integrated P-FET high-side current regulator for accurate brightness control. The ADP1660 supports the setting of different currents for each LED, although this configuration is not recommended. Any mis- match in the forward voltage of the two LEDs translates directly to lower efficiency, as well as lower accuracy of the current for the lower voltage LED. It is recommended that the voltages on the two LEDs be kept within 1 V of one another during operation. The user can disable one LED and use the other LED only, if desired. MODES OF OPERATION When the enable pin is high, the I2C-compatible interface can be used to set the ADP1660 to one of seven modes of operation. These modes are configured using the LED_MOD bits (Bits[2:0]) in Register 0x01 (see Table 7). Table 7. Modes of Operation Set by the LED_MOD Bits LED_MOD Bits Operating Mode 000 Standby mode, consuming 3 µA typical (default) 001 Fixed 5 V output mode 010 Assist light mode with continuous LED current 011 Flash mode with LED currents up to 750 mA available for up to 1.6 sec 100 Independent trigger mode with timeout enabled (LED outputs are disabled if they are on longer than the timer value configured by the FL_TIM bits) 101 Independent trigger mode with timeout disabled (FL_TIM value is ignored) 110 Fixed 5 V output mode with torch mode (total output current must be below 500 mA) 111 Reserved PWM CONTROLLER PGND PGND VOUT SW PGND SGND VIN UVLO OVP FAULT REGISTER IC THERMAL SENSING HP LED SHORT HP LED DRIVER CURRENT SENSE CURRENT SENSE SCL STROBE PGND PGND AGND COUT 10µF L1 1µF INPUT VOLTAGE = 2.7V TO 5.0V CIN 10µF GPIO SDA TORCH EN 5.5V CURRENT SENSE HP LED DRIVER HIGH POWER LED CURRENT CONTROL LED2 UP TO 750mA PGND UP TO 750mA INTERFACE AND CONTROL TORCH TxMASK IO_CFG 2.4V LED1 Figure 16. Detailed Block Diagram |
Numéro de pièce similaire - ADP1660ACBZ-R7 |
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Description similaire - ADP1660ACBZ-R7 |
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