Hi
My customer has question.I am in a hurry and I want comments.
Please cooperate me.
Customers watch this material and design the circuit.
From this Application Note, the waveform was measured under two conditions.
1.R2=1kΩ 2.R2=500Ω
R1=3.9kΩ R1=3.9kΩ
Rflter=3.9kΩ Rflter=3.9kΩ
Cflter=2.2uF Cflter=2.2uF
Rset=2.2Ω Rset=2.2Ω
PWM=Duty10%(3.3V⇔0V)
Please see the attached waveform.
１．When R1=1kΩ,the rise taim of the current wabeform is delayed.
As a result, the current becomes smaller than the original duty 10%.
Is this correct?
２．When R2=500Ω Does it match the waveform expected
by TI Application Note? @ SLVA471.
※Customer are concerned that Peak of the current.(@170mA)
Since customers want to lower the current of light load (Duty 10%) only, we are planning to use R2 = 1 kΩ.
If R2 = 1 kΩ, you want to check if there is something wrong.
Best Regard
T Kishi
