HIGH VOLTAGE H AC Input N Supertex inc. SR10DB1 Inductorless Switching Power Supply Demoboard Introduction: Specifications The Supertex SR10 is an inductorless switching power sup- Parameter Value ply controller intended for operation directly from a rectified 90VAC to 275VAC 120/240VAC line. Due to the capacitor-coupled, switched AC Input 50Hz to 60Hz shunt topology (CCSS), it exhibits low standby power and 6V, 12V, 24V 10% good efficiency while employing no magnetics nor high volt- Output voltage or 6-28V using divider age electrolytic capacitors. 1 Output current up to 50mA To meet a wide variety of applications, the SR10DB1 is 1 No-load input power as low as 20mW highly configurable. Many components are socketed. Half or 1 Efficiency up to 75% full-wave rectification is jumper-selectable. Output voltage is jumper-selectable to 3 fixed voltages or may be set anywhere Actual board size 88mm x 28mm in the range of 6 - 28V using an on-board feedback divider. Notes: 1. Dependent upon configuration and degree of transient protection. Board Layout and Connection Diagram R and R optional for output voltages other Accomodates various capacitor sizes FB1 FB2 than 6, 12, or 24V. Adjustment range is 6 - 28V. Socketed components. Pre-configured for 9V. Pads for 0603 and 0805. H D R + D R R OUT FB1 2 LIM BL DC Output: 6, 12, 24V or D 1 IC adjustable 6 - 28V. 1 D AC Input 4 C FB C V OUT 90-275VRMS Load D OUT C S 3 50/60Hz 24V Rect 12V 6V ADJ R Supertex SR10DB1 FB2 N One lead must always be in this position Jumper-selectable output voltage. Output minus is Jumper must be present. When in connected to AC line Jumper-selectable full-wave the ADJ position, R and R neutral when configured FB1 FB2 or half-wave rectification. must be present. for half-wave rectification. Both jumpers must be in the same position, left or right. AC Input (H and N) DC Output (+ and ) Connect to the AC line. The H terminal should be connected Connect the load to these terminals. Do not connect earth- to the AC line hot conductor. The N terminal should be con- grounded loads or test equipment without using an isolation nected to the AC line neutral conductor. When configured for transformer on the AC line. half-wave rectification, the N terminal is connected to the DC output minus () terminal. Output voltage is jumper-selectable at 6, 12, or 24V, or it may be set in the range of 6 - 28V using the R feedback FB divider and setting the jumper to ADJ. Doc. DSDB-SR10DB1 Supertex inc. A040113 www.supertex.com Half Full - DC Output +SR10DB1 Schematic R BL R LIM D fixed 6, 12, 24, or 9V C OUT S D 1N4001 D (adjustable from 6 - 28V via R ) 1 2 FB1 Rect V IN V 90-275VAC OUT 1 8 50-60Hz 7 R Half Full OUT SH FB1 D6 D 6 422k D 3 4 D12 5 C D24 OUT SR10 D 1.0mF 1-4 4 1N4001 FB R FB2 PGND AGND C 68.1k V FB OUT 470pF 2 3 R TN Bill of Materials Designation Description Value Rating Mfg PN R Resistor, fusible 22 2W any LIM R Resistor 4.7M 1/4W any BL R Resistor 422k 1/4W any FB1 R Resistor 68.1k 1/4W any FB2 C Capacitor, film 220nF to 2.2F 275VAC,X2 any S C Capacitor, alum 220F min 35V any OUT C Capacitor, ceramic NPO 470pF 6V any FB D Rectifier 1A, 50V any 1N4001 1 - 4 D Rectifier 1A, 50V any 1N4001 OUT IC CCSS regulator Supertex SR10 1 For other output voltages, the on-board resistive feedback Socketed Components divider may be used to provide any voltage in the range of The SR10DB1 is provided with all components pre-installed. 6 - 28V. To maintain a minimum 15A through the feedback Other components may be substituted for the on-board com- divider, only R should be changed. ponents to meet other requirements. FB1 Refer to the above schematic and BOM, and the drawing V V OUT OUT R = R -1 = 68.1k -1 and photo on page 1 to determine the proper locations for FB1 FB2 V 1.25V FB the components. Output Voltage Output Current (C selection) S Fixed output voltages of 6V, 12V, or 24V may be selected by Output current is primarily dependent on input voltage, C S setting the appropriate jumper on the V header. OUT value, and rectification (full or half). Given the minimum input voltage and choice of rectification, the minimum value of C S Doc. DSDB-SR10DB1 Supertex inc. A040113 2 www.supertex.com 24V 12V 6V ADJ