DC1569A

DC1569A demonstration circuit is a high voltage monolithic boost converter featuring the LT3958. The LT3958 can be configured as a boost, flyback, SEPIC, and inverting converter, but the demonstration circuit is assembled as a boost. The input voltage range is 11V to 40V and the output voltage is 48V with 500mA over the entire input voltage range. The LT3958 has an internal n-channel 3.3A, 84V power switch for high voltage, power, and efficiency. The dual paddle package provides excellent heat dissipation for the internal power switch. The LT3958 current-mode dc/dc converter features adjustable switching frequency, soft-start, compensation, shutdown and undervoltage lockout with hysteresis, and a feedback pin (FBX) that can be used in both positive and negative applications. A SYNC input can be used to synchronize the switching at a frequency higher than the IC is programmed. The demonstration circuit features small 1210 case size ceramic input and output capacitors.

• 300KHz typical switching frequency at RT = 41.2K
• 10.3V input undervoltage lockout (falling) at R1=392k, R2=53.6k
• 10.9V input turn-on voltage (rising) at R1=392K, R2=53.6K
• 94.6% efficiency at VIN = 12V, ILOAD = 500mA