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AP3154AFG-7 Datasheet(PDF) 10 Page - Diodes Incorporated |
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AP3154AFG-7 Datasheet(HTML) 10 Page - Diodes Incorporated |
10 / 14 page AP3154A 120mA HIGH EFFICIENCY WHITE LED DRIVER AP3154A Rev. 2-4 10 of 14 DECEMBER 2014 www.diodes.com © Diodes Incorporated Disabled Current Sinks Unused current channels must be disabled by connecting the sinks to VOUT with only a small sense current flowing through the disabled channel. Soft-Start and Soft-Stop Soft-start and Soft-stop function are incorporated to prevent excessive inrush current during power-up, mode switching, power-down, transition out of stand-by mode. Short-Circuit Protection Short-circuit protection function is incorporated to prevent excessive load current when either flying cap terminals or output pin electrically tied to a very low voltage or ground. Over-Voltage Protection Over-voltage protection function is incorporated to limit the output voltage under a safe value to avoid on-chip device breakdown. Under-Voltage Lockout Under-voltage lockout feature disables the device when the input voltage drops below UVLO threshold. Thermal Shutdown When the die temperature exceeds the thermal limit, the device will be disabled and enter stand-by mode. The operation will be resumed whenever the die cools off sufficiently. Switching Frequency By default, AP3154A is working at 1.2Mhz switching frequency. It can also work at 0.6MHz or 1.8MHz switching frequency set through SDI. User can choose the appropriate switching frequency with consideration of noise immunity, input/output voltage ripple requirement, and capacitor selection etc. Up Spread Spectrum Control When this feature is enabled through SDI, the switching frequency periodically varies between 100% and 110% of nominal frequency. It flattens the peak energy on nominal frequency over a range of frequency band so that EMI effect is significantly reduced. PWM Dimming Control The AP3154A provides flexible dimming control with either 16-level SDI protocol control or PWM dimming control through SDI pin. When PWM dimming control is enabled, the sink current is adjusted by the duty cycle of the signal applied on SDI pin. Serial Digital Interface SDI Command Timing For an SDI command to be successfully received by the AP3154A, all SDI timing specifications should be satisfied. When no command is being sent the SDI pin should be held high. If the SDI pin goes low and stays low for a time length of between TSLO(min) and TSLO(max) and then goes high and stays high for between TSHI(min) and TSHI(max), one falling edge is registered by the AP3154A. The total number of falling edges registered before the SDI pin is held high for longer than the maximum separation time TSEP(max) identifies the command that has been received by the AP3154A. The next series of falling edges before another separation time TSEP represents the next command. In other words, the AP3154A counts the number of consecutive falling edges on the SDI pin and a different number represents a different command. Each command is executed after it is successfully received. If at any time the SDI pin is held low for longer than the maximum chip disable time TOFF(max), the AP3154A is disabled and enters the shutdown mode. All internal registers are reset to default. Setting the SDI pin high again will re-enable the AP3154A and bring it out of the shutdown mode. The AP3154A enters the SDI mode by default when it is first powered up. The first SDI command 63 (63 falling edges) will put the AP3154A into the PWM mode, where a high level on the SDI pin turns the LEDs on, a low level turns the LEDs off and the duty cycle determines the average LED brightness. The next SDI command 63 will put the AP3154A back into the SDI mode. It should be pointed out that the PWM mode is for dimming control only and configuration settings have to be done in the SDI mode. Channel Configuration Example The following timing diagram is a dimming control example. In this example, the first command (command 10) selects Channel 2 as the configuration target and the second command (command 2) sets the Channel 2 current level to one step lower while the other channels remain unchanged. Functional Description (Continued) |
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Similar Description - AP3154AFG-7 |
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