400W Single Supply BTL Amplifier Circuit Diagram
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This document provides a schematic and description for a 400W single supply class D audio amplifier circuit with overvoltage and undervoltage protection. Key features include: - A HIP4081 chip powers 4 MOSFETs in a bridge topology configuration to provide the amplification. - Zener diodes D9 and D10/D11 set the undervoltage and overvoltage shutdown thresholds to protect the circuit. - Optional indicators show overvoltage and undervoltage conditions. - Components like inductors, gate resistors, and decoupling capacitors are specified to ensure proper operation across a range of supply voltages and MOSFET choices. - The circuit is intended as a simple DIY design without
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400W Single Supply BTL Amplifier Circuit Diagram
- 1. 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 D D C C B B A A Title Number RevisionSize A3 Date: 2.3.2009 Sheet of File: D:Elektronika..Amp 2.SCHDOC Drawn By: BHB 1 BHI 2 DIS 3 VSS 4 BLI 5 ALI 6 AHI 7 HDEL 8 LDEL 9 AHB 10 AHO 11 AHS 12 ALO 13 ALS 14 VCC 15 VDD 16 BLS 17 BLO 18 BHS 19 BHO 20 IC1 HIP4081 15R R11 15R R13 15R R12 15R R14 Q1 FDP3682 Q2 FDP3682 Q3 FDP3682 Q4 FDP3682 +B 12V D1 ES2D 33k R9 33k R10 12V D2 ES2D 12V 330nF / 63V C8 330nF / 63V C7 1 2 3 4 5 6 7 8 IC3 TL3016 14uHL1 14uHL2 330nF C14 OUT+ OUT- 100pF C1 100pF C2 47k R1 47k R7 3,3k R2 3,3k R8 OUT- OUT+ 12V 330nF C6 ceramic D5 BAS316 D6 BAS316 D7 BAS316 D8 BAS316100pF C9 100pF C10 100pF C12 100pF C11 10R R17 10R R15 10R R16 10R R18 5V DIS OutA OutB IN 3 2 OUT 1 GND IC4 L78L05ABZ 100nF C3 12V +B IN 1 3 OUT 2 GND IC5 L78S12CV Vext 10uF / 35V C4 100nF C5 2,2uF C13 1kR4 1kR5 In+ 3,3k R3 3,3k R6 In- 100nF C21 100nF C22 100nF C27 100nF C28 330nF C15 330nF C16 330nF C17 100nF C23100pF C24 100nF C25 100nF C26 10uF C29 10uFC30 D9 Z39 D11 Z39 D10 Z36 D12 Red +B Q7 BF820 Q8 BF820 47k R30 47k R31 18k R32 10k R33 47k R34 47k R35 OVP UVP Q9 BF820 470k R36 D13 green 12V DIS 10k R37 100nF C19 100nF C20 10k R38 33pF C18 Overvoltage and undervoltage protection circuit with indicator leds. C19-C27 are local decoupling capacitors for power mosfets and should be placed close to them 400W single supply BTL UcD amplifier Dubravko Mrakuzic 2.0 Both inductors are wound on the same core (gapped Epcos RM14 N87). For bootstrap and gate diodes I used LL4148 instead of what is written in schematic. Power output could be easy scaled by changing the +B voltage (in my case 60V). Note that HIP4081 can tolerate max 80V. For use with different supply voltage which is a lot different than mine it might be necessary to change the value of D9 which sets the undervoltage shutdown threshold to 40V and D10,D11 which set overvoltage threshold to 76V. One can easily omit OVP and UVP protections and connect pin 3 of HIP4081 to system GND for correct operation. This circuit does not have any kind of overcurrent protection for simplicity of the circuit because this is intended for diy. When using different mosfets, one might need to adjust the dead time resistors R9 and R10 and gate resistors values for proper operation.