Introduction bus ic dc/dc converter motor driver ic ripple counter driver ic I/O ic Sensor interface ic sensor ic ip’s ÿ E 910.22 Wide range flyb. SMPS with WD E 910.24 | 25 | 26 PFM controller family E 910.27 Step down converter, fully integr. E 981.03 Energy storage controller E 910.28 Step down converter, for ext. FET ÿ Wide range flyback SMPS with watchdog features application ÿ Flyback converter with wide input range of 3V to 55V ÿ Automotive electronics ÿ 5V first output voltage ÿ Controller and sensor supply ÿ Additional output voltages possible with additional description windings on transformer E910.22 pinning package Pin Name Description 1 VDRV 2 DRV 3 PGND Driver stage power ground 4 K15D K15 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 Disable watchdog input, active low Bypass capacitor input for driver stage power supply Driver stage output signal ÿ Softstart capability The IC is developed and optimized for automotive applications ÿ ON control input with wide input voltage range where it can generate different output voltages as a flyback con- ÿ Precise, programmable windowed watchdog verter. The input voltage may be higher or lower than the output ÿ Low standby current (50µA typical) voltage. The multi-loop regulation concept ensures fast response ÿ Open load stable to input voltage and load changes. The reset circuit generates a ÿ Snapback output current after short circuit on load reliable reset signal until the output is in tolerance and the inte- 8 DWD ÿ K15D control input grated, programmable windowed watchdog guarantees a mini- 9 SYS_EN ÿ Self-oscillating, multi-loop regulation mum and maximum software reset time. An additional system- ÿ Non dissipating primary current simulation enable output enables critical components after the controller 10 RESET ÿ Degausing input and variable delayed switch on has served the watchdog three times to guarantee a save control- 11 RWD Resistor input for watchdog oscillator timing ÿ Push/pull driver for logic level Power-MOSFET ler wake up sequence. This successful wake up also enables the 12 DEG Resistor input for degausing detection ÿ No shunt needed ‘HOLD’-capability so that the controller can keep the converter 13 RES Resistor input for resonance delay adjustment ÿ – 40°C to + 125 ºC operating temperature running without ‘ON’ and ‘K15D’ active. 14 CMP Error amplifier compensation output ÿ Additional system-enable output for critical 15 RDC Resistor input for drain current simulation 16 VOUT Feedback input of SMPS outer regulation loop 17 AGND Analog ground 18 VS Supply voltage input 19 VSM 20 VAUX modules ÿ SO20w package Watchdog system enable, open drain output, active low VDRV 1 20 DRV 2 19 PGND 3 18 K15D 4 17 HOLD 5 16 ON 6 15 TCL 7 14 DWD 8 13 SYS_EN 9 12 10 11 RESET VAUX VSM VS AGND VOUT0 RDC CMP RES DEG RWD so20 Watchdog reset pulse open drain output, active low Bypass capacitor input for internal circuits power supply Auxiliary voltage input for internal circuits Block diagram VBAT VS RRDC RDC VSM VDRV internal Supply FET DRV RWD PGND TCL DWD RESET watchdog DEG SYS_EN RES SMPS ON VAUX Circuit HOLD VOUT control K15 CMP K15D E910.22 28 DRV 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 © 2007 ELMOS Reproduction, in part or whole, without the prior written consent of ELMOS, is prohibited. www.elmos.de | [email protected] elmos product catalog 2007/2008 29