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AAT1235 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT1235 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
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9 / 21 page  AAT1235 High Efficiency White LED Drivers for Backlight and Keypad 1235.2007.02.1.1 9 Functional Block Diagram Boost Converter Control VIN LIN IN SW AS2Cwire Control ROM V(A1, A2, A3) VREF V(B1, B2) VREF B1 A3 A2 A1 B2 D/A ROM Max Current Adjustment RSET AGND OV GND EN/SET D/A D/A D/A D/A Functional Description The AAT1235 consists of a controller for the step-up switching converter and its power switch, and five regulated current sinks each programmable at 16 levels into two groups, which can be turned on/off individually. An external Schottky diode, a power inductor, an output capacitor, and a resistor divider are required to complete the solution. The AAT1235's boost controller is designed to deliver 100mA up to 24V. The AAT1236 is capable of driving a total of five channels divided into two groups with four white LEDs connected in series at each channel. The output load current can be programmed by the current sink magnitudes. AS2Cwire programming allows independent control of two current sink groups (A1 to A3 and B1 to B2) and control on/off with a different configuration on each channel. Unused sink channel(s) must be connected to AGND to ensure proper function of the AAT1235. Control Loop The AAT1235 provides the benefits of current mode control with a simple hysteretic output cur- rent loop providing exceptional stability and fast response with minimal design effort. The device maintains exceptional constant current regulation, transient response, and cycle-by-cycle current limit without additional compensation components. The AAT1235 modulates the power MOSFET switching current to maintain the programmed sink current through each channel. The sink voltage at each channel is monitored and the controller pro- vides direct feedback in order to maintain the desired LED current. |
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