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Summary of Contents for Allegro A8580
- Page 1 Demo Note for the A8580 Evaluation Board 4.0V – 40V 3.3V , 2.5A, 425KHz Asynchronous Buck Regulator with Low IQ PFM Mode Page 1 of 13 December 18 , 2012...
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Page 2: General Specifications
Note: Set SW1 to the “OFF” position before driving the SLEEPn test point by a pulse generator or an external power supply. Note: Continuously applying more than 5.5V to the PWM/PFMn pin may damage the A8580. Output Load Connections: Connect a load from V to GND. - Page 3 1) Jumper J1 must be set to the “lower” position (shown below) so the on-board 3.3V LDO (U2) will deliver the BIAS voltage to the A8580. 2) Diode D2 must be rotated 90° clockwise so it is “in circuit” and the 3.3V LDO (U2) will operate.
- Page 4 Note: CB is an optional, bulk, electrolytic capacitor for general supply filtering DEMO BOARD BILL-OF-MATERIALS REFERENCE DESIGNATORS DESCRIPTION FOOTPRINT QTY. MANUFACTURER MANUFACTURER P/N SOURCE PURCHASE P/N Allegro A8580 PCB for eTSSOP16, Rev 0.1 4pcb.com MicroSystems Allegro A8580, 2A Buck Regulator eTSSOP-16 A8580 MicroSystems Regulator, LDO, 3.3V/250mA SOT23-5 National Semi LP2992IM5-3.3...
- Page 5 DEMO BOARD PERFORMANCE Efficiency vs I (PWM Mode) 8Vin 12Vin 16Vin 1000 1500 2000 2500 Iout (mA) Efficiency vs I (PFM Mode) 1000 10000 100000 Iout (µA) Page 5 of 13 December 18 , 2012...
- Page 6 DEMO BOARD PERFORMANCE Load Regulation vs I 0.00 8Vin 12Vin 16Vin -0.10 -0.20 -0.30 -0.40 1000 1500 2000 2500 Iout (mA) Line Regulation vs V at 1.0A 0.50 0.25 0.00 -0.25 -0.50 Vin(V) Page 6 of 13 December 18 , 2012...
- Page 7 DEMO BOARD PERFORMANCE Bode Plot: 12V , 330mA Load: 0dB at 59.7KHz, PM=64.3deg, GM=11.3dB Bode Plot: 12V , 2.5A Load: 0dB at 66.8KHz, PM=60deg, GM=8.6dB Page 7 of 13 December 18 , 2012...
- Page 8 DEMO BOARD PERFORMANCE Component Temperatures: 12V , 3.3V , 500mA Load, T =25°C No Airflow (still air) Component Temperatures: 12V , 3.3V , 2.5A Load, T =25°C No Airflow (still air) Page 8 of 13 December 18 , 2012...
- Page 9 DEMO BOARD PERFORMANCE PWM Startup PWM Shutdown , 2.5A (1.3Ω) load, PWM/PFMn=1 , 2.5A (1.3Ω) load, PWM/PFMn=1 CH1=V , CH2=COMP, CH3=SS, CH4=SLEEPn CH1=V , CH2=COMP, CH3=SS, CH4=SLEEPn PWM Output Voltage Ripple PWM Transient Response , 2.5A (1.3Ω) load, PWM/PFMn=1, , 1A load step up/down, CH1=V PWM/PFMn=1 CH1=V...
- Page 10 DEMO BOARD PERFORMANCE PWM to PFM Transition PFM to PWM Transition , 470mA (7Ω) load , 470mA (7Ω) load CH1=V , CH2=COMP, CH3=SW, CH1=V , CH2=COMP, CH3=SW, CH4=PWM/PFMn CH4=PWM/PFMn PFM Output Voltage Ripple PFM Output Voltage Ripple , 1mA (3.3KΩ) load , 400mA (8Ω) load CH1=V CH1=V...
- Page 11 DEMO BOARD PERFORMANCE SW Voltage at 12V , 100mA load, SW Voltage at 12V , 2.5A load, PWM/PFMn=1 PWM/PFMn=1 CH3=SW CH3=SW Input Voltage Ripple at 12V , 2.5A load, Output Shorted, Hiccup Mode Operation, PWM/PFMn=1 PWM/PFMn=1 CH1=V CH1=V , CH2=COMP, CH3=SS, CH4=I Page 11 of 13 December 18 , 2012...
- Page 12 DEMO PCB LAYOUT Top Layer and Top Silk Layer 2 and Top Silk Page 12 of 13 December 18 , 2012...
- Page 13 DEMO PCB LAYOUT Layer 3 and Top Silk Bottom Layer and Bottom Silk Page 13 of 13 December 18 , 2012...
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