Part Number:LM5176
Dear All,
In our new project we are using LM5176 as a supercap charger. Main specifications are;
Vin=18V~36V
Vout=45V
Iout=1A
Cout=1.32mF created by 60x 22uF@1.2R Al-El caps.
Fs=400Khz
L=100uH with 18mR DCR
During prototype work we could not boost Vout to 45V even without supercapacitor load. While trying to get in work, we rearranged FB point to Vout=5V and strangely we saw that Bottom FET of Boost leg is ON with ~5% percent duty.
what woould be the reason, which poiny(s) should i check?
Could you pls help us?
Thanks in advance.
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