MB39A214APFT-G-JNERE1 Datasheet, PDF (28/56 Pages) Fujitsu Component Limited. – 2ch DC/DC converter IC with PFM/ PWM synchronous rectification

MB39A214A
Setting soft-start time
Calculate the soft-start time by the following formula.
t_s = 7 ¯ 10⁵ ¯ C_CS
t_s : Soft-start time [s] (time until output reaches 100%)
C_CS : CS pin capacitor value [F]
Calculate the delay time until the soft-start activation by the following formula.
t_d = 43 ¯ C_VB
t_d : VB voltage delay time (at V_IN = 12 V) [s]
C_VB : VB pin capacitor value [F]
When activating the other in the state where a side channel has already been activated (UVLO release: VB
output already), the delay time is hardly generated.
EN1
ts1
ts2
EN2
VOUT1
VOUT2
td
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DS405-00007-1v0-E