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| BUS IC DC/DC CONVERTER y Wide range SMPS with watchdog Wide range SMPS with reset PFM controller family Step down converter, fully integrated Step down converter, for external FET PWM controller for LED MOTOR DRIVER IC RIPPLE COUNTER DRIVER IC I/O IC SENSOR IC SENSOR INTERFACE IC y Wide range SMPS with watchdog FEATURES y y y y y y y y y y y y y y y y y y Flyback converter with wide input range of 3V to 55V 5V first 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 (50A typical) Open load stable Snapback output current after short circuit on load K15D 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 - 40C to + 125 C operating temperature Additional system-enable output for critical modules SO 20w package DESCRIPTION The IC is developed and optimized for automotive applications where it can generate different output voltages as a flyback converter. 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 integrated, programmable windowed watchdog guarantees a minimum and maximum software reset time. An additional systemenable output enables critical components after the controller has served the watchdog three times to guarantee a save controller wake up sequence. This successful wake up also enables the `HOLD'-capability so that the controller can keep the converter running without `ON' and `K15D' active. APPLICATION y y Automotive electronics Controller and sensor supply PINNING Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name VDRV DRV PGND K15D HOLD ON TCL DWD SYS_EN RESET RWD DEG RES CMP RDC VOUT AGND VS VSM VAUX Description Bypass capacitor input for driver stage power supply Driver stage output signal Driver stage power ground K15 terminal signal level detection Hold signal input Unconditional SMPS power up, active high Watchdog timer clear input signal; active low Disable watchdog input, active low Watchdog system enable, open drain output, active low PACKAGE E910.22 VDRV DRV PGND K15D HOLD ON TCL DWD SYS_EN RESET 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VAUX VSM VS AGND VOUT0 RDC CMP RES DEG RWD Watchdog reset pulse open drain output, active low Resistor input for watchdog oscillator timing Resistor input for degausing detection Resistor input for resonance delay adjustment Error amplifier compensation output Resistor input for drain current simulation Feedback input of SMPS outer regulation loop Analog ground Supply voltage input Bypass capacitor input for internal circuits power supply Auxiliary voltage input for internal circuits BLOCK DIAGRAM VBAT VS VSM RRDC RDC internal Supply FET DRV VDRV DRV PGND RWD TCL DWD RESET SYS_EN watchdog DEG RES SMPS ON HOLD VAUX VOUT Circuit control K15 K15D CMP AGND 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 significantly affect its safety or effectiveness. Products are not authorized for use in such applications. Copyright (c) 2005 ELMOS Reproduction, in part or whole, without the prior written consent of ELMOS, is prohibited. www.elmos.de | sales@elmos.de 24 elmos product catalog june 2005 25 |
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