Datasheet

LM1577, LM2577
SNOS658D –JUNE 1999–REVISED APRIL 2013 www.ti.com
(15)
Where ∑I
LOAD(max)
is the sum of the load current (magnitude) required from both outputs. Select a resistor less
than or equal to this value, and no greater than 3 kΩ.
B. Calculate the minimum value for ∑C
OUT
(sum of C
OUT
at both outputs) using the following two equations.
(16)
The larger of these two values must be used to ensure regulator stability.
Figure 41. Flyback Regulator Waveforms
T1 = Pulse Engineering, PE-65300
D1, D2 = 1N5821
Figure 42. LM1577-ADJ/LM2577-ADJ Flyback Regulator with ± Outputs
Table 5. Flyback Regulator Formulas
Duty Cycle D
(17)
Primary Current Variation
ΔI
P
(18)
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