bus ic dc/dc converter motor driver ic ripple counter 24 block diagram driver ic i/o ic sensor ic sensor interface ic 25 elmos product catalog june 2 00 5 note elmos semiconductor ag (below elmos) reserves the right to make changes to the product contained in this publication without notice. elmos assumes no responsibility for the use of any circuits described herein, conveys no licence under any patent or other right, and makes no representation that the circuits are free of patent infringement. while the information in this publication has been checked, no responsibility, however, is assumed for inaccuracies. elmos does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of a life-support system or to signi?cantly affect its safety or effectiveness. products are not authorized for use in such applications. copyright ? 2 00 5 elmos reproduction, in part or whole, without the prior written consent of elmos, is prohibited. www.elmos.de | sales@ elmos .de pinning package ? wide range smps with watchdog wide range smps with reset pfm controller family step down converter, fully integrated step down converter, f o r external fet pwm controller for led features ? flyback converter with wide input range of 3 v to 55 v ? 5 v ?rst output voltage ? additional output voltages possible with additional windings on transformer ? softstart capability ? on control-input with wide input voltage range ? precise, programmable windowed watchdog ? low standby current ( 5 0 a typical) ? open load stable ? snapback output current after short circuit on load ? k 1 5 d control-input ? self-oscillating, multi-loop-regulation ? non dissipating primary current simulation ? degausing input and variable delayed switch on ? push/pull driver for logic level power-mosfet ? no current shunt needed ? C 4 0 c to + 1 2 5 oc operating temperature ? additional system-enable output for critical modules ? so 2 0 w package a pplication ? automotive electronics ? controller and sensor supply d escription the ic is developed and optimized for automotive applications where it can generate different output voltages as a ?yback con - verter. the input voltage may be higher or lower than the output voltage. the multi-loop-regulation concept ensures fast response to variation of input voltage and load. the reset circuit generates a reliable reset signal until the output is in tolerance and the inte - grated, programmable windowed watchdog guarantees a mini - mum and maximum software reset time. an additional system- enable output enables critical components after the controller has served the watchdog three times to guarantee a save control - ler wake up sequence. this successful wake up also enables the hold-capability so that the controller can keep the converter running without on and k 1 5 d active. ? wide range smps with watchdog e 9 1 0 . 22 vba t smps circuit control watchdog internal supply fet dr v rrdc rdc vdr v dr v pgnd deg res vaux vout cmp k15d k15 hold on sys_en reset dwd tcl rw d vsm vs agnd 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 vdr v dr v pg nd k 15 d hold on tc l dw d sys_en r eset va ux vs m vs ag nd vo ut 0 rd c cmp re s deg rw d pin name description 1 vdrv bypass capacitor input for driver stage power supply 2 drv driver stage output signal 3 pgnd driver stage power ground 4 k 1 5 d k 1 5 terminal signal level detection 5 hold hold signal input 6 on unconditional smps power up, active high 7 tcl watchdog timer clear input signal; active low 8 dwd disable watchdog input, active low 9 sys_en watchdog system enable, open drain output, active low 1 0 reset watchdog reset pulse open drain output, active low 11 rwd resistor input for watchdog oscillator timing 1 2 deg resistor input for degausing detection 1 3 res resistor input for resonance delay adjustment 1 4 cmp error ampli?er compensation output 1 5 rdc resistor input for drain current simulation 1 6 vout feedback input of smps outer regulation loop 1 7 agnd analog ground 1 8 vs supply voltage input 1 9 vsm bypass capacitor input for internal circuits power supply 2 0 vaux auxiliary voltage input for internal circuits
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