Other Parts Discussed in Thread: LM5026,
Hello.
The reference design is specified at Vin = 9V to 60V but the LM5026 is rated at Vin = 13V to 100V.
The specified input voltage range of this reference design is Vin = 9V to 60V. This looks good for our application of Vin = 10.5V to 60V
But, when I consult the data sheet of the LM5026 - section 6.3 Recommended Operating Conditions - Vin is specified at 13V minimum.
On the schematic for PMP22075, the Vin is connected directly to the Vin of LM5026.
Data sheet section 8.1.2. allows the LM5026 to operate below 13V - IF Vin and VCC are tied together via an external regulator.
For applications where the system input voltage exceed 100 V or IC power dissipation is a concern, the LM5026
can be powered from an external start-up regulator as shown in Figure 25. In this configuration, the VIN and the
VCC pins should be connected together, which allows the LM5026 to be operated below 13 V.
However, in the Schematic for PMP22075, Vin is Not connected to VCC on the LM5026.
My question is: does the PMP22075 design work when Vin is less than 13V?
Thanks,
Fraser
