STEVAL-ISA029V1 Compact power supply for DVD/set top box evaluation board with three Vout (-30 V, +3.3 V, +12 V) Data Brief Features ■ Input voltage range 85 VAC – 300 VAC ■ VOUT1= 12 V (±5%) ■ IOUT1= 1 A ■ VOUT2= 3.3 V (±2%) ■ IOUT2= 100 mA ■ VOUT3= -24 V (±10%) ■ IOUT3= 40 mA ■ Safety EN60950 compliant ■ EMI - conducted EN55022-B compliant STEVAL-ISA029V1 Description The STEVAL-ISA029V1 evaluation board is an isolated triple-output flyback converter, suitable for wide-range input voltage operation. The converter is based on the smart power VIPer53-E, which integrates, in the same package, an enhanced current-mode PWM controller with a high-voltage MDmesh™ Power MOSFET. The switching frequency is set to 60 kHz by means of an external RC network connected to a dedicated pin on the IC. The closed loop regulation is performed on the 12 V output using an optocoupler, which drives the COMP pin of the VIPer. The 3.3 V output is post regulated using a non-integrated low drop linear voltage regulator to achieve the required accuracy. The negative 24 V output is achieved by means of a discrete linear voltage regulator, made up of a Zener diode, a resistor and a PNP transistor. December 2007 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 CON2 2 1 C6 22u t 2 C8 4.7n 5.6k R3 50 1 RT1 100n 400V C11 100n R8 2.2k 4 3 2 1 C1 VIPER53 SOURCE SOURCE OSC COMP U2 10mH L1 4 1 FUSE 3 N.C. VDD TOVL C9 10n DRAIN 2 J1 5 6 7 8 R4 100n 400V C2 C17 2.2n 1kV R13 470 1k 4 - 1 C3 47u 400V + 3 C7 100n R2 10 D2 4.7n 400V TRANSIL - N.M. D3 C4 STPS1150 STTH110 D7 D5 15k 2W R1 DIODE BRIDGE D9 STTH110 2 F1 4 3 2 1 2.2n 5 6 7 8 COUT1 22u D1 STTH102 U5 PC817B TL431 U4 1 R5 1k D6 STPS2H100 TRANSFORMER T1 3 2 2/4 R11 BD140 R6 1k R9 N.M. 47k C13 68n C10 R10 4.7k R7 18k 100n C16 D4 +12V R15 180 1W STTH102 -24V Come transistore di potenza: BD140 BSS44 D8 COUT3 C14 1500u 100n - NM ZENER 24V 820 Q1 R12 330 330u COUT2 4 U1 LK112M33TR 5 1 C5 100n 4.7u C15 +3.3V 1 2 3 4 5 6 7 CON7 J2 Figure 1. 2 1 3 C12 Board schematic STEVAL-ISA029V1 Board schematic Schematic STEVAL-ISA029V1 2 Revision history Revision history Table 1. Document revision history Date Revision 06-Dec-2007 1 Changes Initial release. 3/4 STEVAL-ISA029V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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