Hello Team,
I have several questions related to internal function & calculation formula on datasheet from my customer.
Q1: Equation (4) on datasheet, page-11 is showing the primary peak current(Ipri_pk) in BCM operation mode.
a) How was the constant "2" in the equation delived?
b) It doesn't include the efficiency. What is the equation when considering efficiency?
Q2: Equations (39) & (40) on datasheet, page-29 are showing the calculation of transformer turns ratio and LMAG on Figure-51 dual output application(VOUT1=24V, VOUT2=5V).
In these two equations, 19V(voltage difference of two outputs) has been used for "term of VOUT1" actually.
a) Is using 19V for VOUT1 in both equations correct? What is the reason to use 19V?
Q3: This part has three operation modes(FFM, DCM & BCM) and the border to change the operation mode is been explaining in datasheet section 7.3.2 in the case of decreasing of load current.
a) About the timing of operation change in case of increasing of load current, is there any timing hysteresis compared with decreasing of load current?
b) The threshold current to shift from DCM to FFM has been as 0.3A(=1.5A x 20%). What is the accuracy of this 0.3A threshold current?
Best regards,
H.Someno
H. Someno
