E910.27A View Datasheet(PDF) - ELMOS Semiconductor AG

Part Name

Description

MFG CO.

E910.27A

External Adjustable High Efficiency PFM Step-Down Converter

ELMOS Semiconductor AG 

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- Preliminary -

E910.27A

Table of Figures

Figure 2.2-1: Pinout TSSOP24 ADT-1................................................................................................................5

Figure 3-1: Blockdiagram....................................................................................................................................6

Figure 7.1.1-1: Typical Application Circuit........................................................................................................16

Figure 7.7.2-1: Time Response Power Good and Reset Generation..............................................................19

Figure 7.7.3-1: Watchdog Behaviour, Time Response.....................................................................................20

Figure 7.8-1: Choke Current Waveform............................................................................................................21

Figure 7.8.4-1: Relative Switching Frequency in Continuous Conduction Mode.............................................23

Figure 8.1.6-1: Discontinuous Mode Switch Drain Voltage without and with Snubber....................................31

Figure 8.1.7-1: Typical Thermal Resistance (RTAJ) versus PC-Board Area...................................................33

Figure 9-1: Typical Converter Schematic for PCB Layout................................................................................34

Figure 10.1.1-1: Blockdiagram of Block X1......................................................................................................36

Figure 10.2-1: µP Power Supply with RESET and Watchdog..........................................................................37

Figure 10.2-2: µP Power Supply Wake-Up by CAN-Transceiver.....................................................................37

Figure 10.2-3: Main Power Supply Wake-Up by auxiliary CMOS Processor...................................................38

Figure 10.2-4: Discontinous Mode Automotive Power Supply.........................................................................38

Figure 10.2-5: External programmable Power Amplifier...................................................................................39

Figure 10.2-6: Step-Down Converter with tracking auxiliary Output................................................................39

Figure 10.2-7: Extremely low Stand-By Current high efficiency 1A LED Driver...............................................40

Figure 10.2-8: High efficiency Step-Down 1A LED Driver with Dimming.........................................................40

Figure 10.2-9: Dimmable high current LED Cluster Driver...............................................................................41

Figure 10.2-10: 1A LED Driver with temperature Protection............................................................................41

Figure 10.2-11: Power-Up Sequencing Example.............................................................................................42

Figure 11.2-1: Package Outlines of TSSOP24 ADT-1.....................................................................................44

ELMOS Semiconductor AG

Specification 50 / 50

03SP0357E.00 05.09.2006

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