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TPS61055DRCT Datasheet(PDF) 11 Page - Texas Instruments |
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TPS61055DRCT Datasheet(HTML) 11 Page - Texas Instruments |
11 / 30 page 16-bitPrescaler Safety Timer LEDCURRENT CONTROL Tx-TOFF tSTIM 2MHzCLOCK EdgeDetect Start 0: TORCHCURRENT LEVEL 1:FLASHCURRENT LEVEL 122Hz MODE1 400kW 30.5Hz Duty-CycleGenerator(6.3%) LEDON/OFFCONTROL 0:LEDOFF 1: TORCHCURRENT LEVEL LEDCURRENT CONTROL ILED 0 0 TorchCurrent 0 1 TorchCurrent 1 0 FlashCurrent 1 1 Torch Current Tx-TOFF 400kW MODE0 FLASH_SYNC TPS61054, TPS61055 www.ti.com SLUS760B – SEPTEMBER 2007 – REVISED SEPTEMBER 2015 Functional Block Diagrams (continued) Figure 13. Timer Block Diagram of TPS6105x 9.3 Feature Description 9.3.1 Operation In boost mode, the duty cycle of the converter is set by the error amplifier and the saw-tooth ramp applied to the comparator. Because the control architecture is based on a current-mode control, a compensation ramp is added to allow stable operation at duty cycles larger than 50%. The converter is a fully-integrated synchronous-boost converter, always operating in continuous-conduction mode. This allows low-noise operation, and avoids ringing on the switch pin, which would be seen on a converter when entering discontinuous-conduction mode. The TPS6105x device not only operates as a regulated current source but also as a standard voltage-boost regulator. This additional operating mode can be useful to properly synchronize the converter when supplying other high-power devices in the system, such as a hands-free audio power amplifier, or any other component requiring a supply voltage higher than the battery voltage. The mode of operation (shutdown, torch and flash modes, constant voltage regulation) selection is done through the MODE0/1 control inputs. Table 2. TPS6105x Operating Modes MODE1 MODE0 OPERATING MODES 0 0 Power stage is in shutdown. The output is either connected directly to the battery through the body diode of the rectifier. LED is turned on for torch light operation. The converter is operating in the current regulation mode (CM). 0 1 The output voltage is controlled by the forward voltage characteristic of the LED. LED is turned on for flashlight operation. The converter is operating in the current regulation mode (CM). 1 0 The output voltage is controlled by the forward voltage characteristic of the LED. LED is turned off and the converter is operating in voltage regulation mode (VM). 1 1 The output voltage is regulated to 5.0 V. Copyright © 2007–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS61054 TPS61055 |
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