LM1577, LM2577
SNOS658D –JUNE 1999–REVISED APRIL 2013
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(15)
Where ∑ILOAD(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 ∑COUT (sum of COUT 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)
(18)
Primary Current Variation
ΔIP
24
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