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| EV0007 Monolithic Power Systems General Description The EV0007 is a 2A evaluation board based on the MP1580 DC to DC Converter. The MP1580 is a monolithic step down switch mode converter with a built in internal Power MOSFET. It achieves 2A continuous output current over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. In shutdown mode the regulator draws 23A of supply current. The MP1580 requires a minimum number of readily available standard external components. A synchronization pin allows the part to be driven to 600KHz. 2A MP1580 Step Down Switch Mode Converter EVALUATION BOARD Absolute Maximum Ratings Supply Voltage (VVIN) Switch Voltage (VSW) Boost Voltage Feedback Voltage (VFB) EN/UVLO Voltage (VEN) COMP Voltage (VCOMP) Sync Voltage (VSync) 28V -1V to VIN +1V VSW + 6V -0.3 to 6V -0.3 to 6V -0.3 to 6V -0.3 to 6V Recommended Operating Conditions Input Voltage VVIN 4.75V to 25V Ordering Information Board Number EV0007 MPS IC Number MP1580HS For Tape & Reel use suffix - Z (e.g. MP1580HS-Z) Figure 1: EV0007 Evaluation Board EV0007 Rev 1.5_08/14/02 www.monolithicpower.com 1 EV0007 Monolithic Power Systems Figure 2: EV0007 Schematic External Power Supply 2A MP1580 Step Down Switch Mode Converter EVALUATION BOARD L1 Available Output Voltages (VOUT) 1.22 V C4 J1 J2 1.5 V J3 1.8 V J4 2.5 V J5 3.3 V J6 5V VOUT GND CN2 1 2 3 4 -+ D1 R2A CB CN1 R2B R2C R2D R2E 1 2 3 BS IN SW GND SYNC EN COMP FB 8 VIN=4.75V to 25V 1 GND 2 3 Sync 4 EN 7 External Load 6 C1 4 5 R1 RC CCA U1 MP1580HS CC Board Operation This board is laid out to accommodate most commonly used Inductors and Output Capacitors and to be programmed for most standard Output Voltages. 1) Attach positive end of load to pin 1 = 2 and negative end of load to pin 3 = 4 of connector CN2. 2) For the required output voltage (VOUT = 1.22, 1.5, 1.8, 2.5, 3.3 or 5V) solder blob the appropriate J1 thru J6 jumper respectively. 3) Attach input voltage (VIN) and input ground (GND) to Pin 1 and 2 of connector CN1 respectively. Note VIN must be 4.75V < VIN < 25V. 4) Pin 3 of CN1 is used to synchronize the internal oscillator frequency of the MP1580 to an external source. The synchronization rate can be vary from 380KHZ (normal operation) to 600KHz. There is an internal 11K pull down resistor to GND therefore leave this pin unconnected if unused. 5) Applying a voltage greater than 2.495V to pin 4 of CN1 enables the MP1580. Leave the input unconnected if unused. An Under Voltage Lockout (UVLO) function can be implemented by the addition of a resistor divider from VIN to GND. For complete low current shutdown its needs to be less than 0.7V. EV0007 Rev 1.5_08/14/02 www.monolithicpower.com 2 EV0007 Monolithic Power Systems Table 1: EV0007 Bill of Materials # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Qty 1 2 1 1 1 1 1 1 1 2 1 1 1 1 1 Reference U1 CN1, CN2 CB CC CCA C1 C4 D1 L1 RC, R1 R2A R2B R2C R2D R2E Part Number MP1580HS 4 Pin Connector 10nF 0603 22nF 0603 100pF 0603 10F 25V 1210 22F 10V Y5V 1210 B230/SM 2A 30V Schottky 22H 10K 1% 2.32K 1% 4.75K 1% 10.5K 1% 16.9K 1% 30.9K 1% 2A MP1580 Step Down Switch Mode Converter EVALUATION BOARD Table 2. Recommended components for standard output voltages VOUT 1.22V 1.5V 1.8V 2.5V 3.3V 5.0V Jumper Connection J1 J2 J3 J4 J5 J6 L1 minimum 6.8H 6.8H 10H 10H 15H 22H RC 4.7K 4.7K 4.7K 10K 10K 10K EV0007 Rev 1.5_08/14/02 www.monolithicpower.com 3 EV0007 Monolithic Power Systems Figure 3: EV0007 Layout 2A MP1580 Step Down Switch Mode Converter EVALUATION BOARD NOTICE: MPS believes the information in this document to be accurate and reliable. However, it is subject to change without notice. Please contact the factory for current specifications. No responsibility is assumed by MPS for its use or fit to any application, nor for infringement of patent or other rights of third parties. EV0007 Rev 1.5 08/14/02 (c) 2002 MPS, Inc. Monolithic Power Systems, Inc. 983 University Ave, Building D, Los Gatos, CA 95032 USA Tel: 408-395-2802 Fax: 408-395-2812 Web: www.monolithicpower.com 4 |
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