Datasheet E522.80, E522.81, E522.82, E522.83 (Elmos) - 9

link to page 17 link to page 9 link to page 10 link to page 12 link to page 13 link to page 14 Triple 150mA Linear LED Controller E522.80/81/82/83 Production Data - May 5, 2017 5 Functional Description 5.1 Overview E522.80/81/82/83 family devices provide independent triple linear current controller for LED driving, which can optionally be operated in parallel for higher current requirements. These family members support individual current configuration and in- dependent digital PWM dimming per channel (see IR interface). Various diagnostic features are provided to meet automotive requirements, together with a communication interface named “RUN” to link ICs to generate more than three channels. ICs linked in this way can be operated as a combined cluster of drivers, turning ‘on’ and ‘off’ in parallel (e.g. turning all drivers ‘off’ in case of hardware failures). Two external configurable modes of operation allow - either “Failure Feedback Mode” FFM (operating channels in case of errors, with error signalization) - or in “Single Lamp Mode” (turning all linked E522.8x´s channels “off” in case of errors) Typical exemplary application topologies are presented in „5.8 Exemplary Application Topologies“. More information on the LEDx drivers and power management can be found in „5.2 LED Driver“. For more details on the configuration and dimming via IRx interface see „5.3 IR Driver“. A detailed overview of functional states is given in „5.4 State Diagram“. Configuration of FFM or Single Lamp Mode is described in „5.5 SLM Interface“. Diagnostic features are located in „5.6 RUN Interface and Diagnostics“. Family members for lower current applications are provided as products E522.84/85/86/87, providing a high degree of func- tional compatibility to E522.80/81/82/83 at e.g. “RUN” pin. See the according data sheet for more details on these products. 5.2 LED Driver High side drivers for LEDx provide the current configured by the according IRx pin, reproducing the IIRx with a typical amplifica- tion factor of 960:1. In E522.8x there are redundant outputs LEDxA and LEDxB to provide this current. These pins are intended for advanced thermal management (see Typical Application Diagram), sharing IC power with an external power sink as follows: Power Distribution Principle in E522.80/81/82/83 Applications Power as a function of V ( VS ) Exemplary for V ( LED ) = 6V and different ext. Shunts ( Single-Channel Calculation ) 2,00 1,60 PLED P(R1=33Ohm) P(E522.8x)@R1 P(R2=56Ohm) 1,20 P(E522.8x)@R2 ] P(R3=82Ohm) P(E522.8x)@R3 P [ W 0,80 0,40 0,005,0 10,0 15,0 20,0 25,0 30,0 V (VS) [ V ] Figure 1. Power Management Example using a Channel of E522.8x at 120mA Elmos Semiconductor AG reserves the right to change the detail specifications as may be required to permit improvements in the design of its products. Elmos Semiconductor AG Data Sheet QM-No.: 25DS0132E.03 9/25