S-8521 datasheet(17/44 Pages) SII

17 / 44 page

STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER

Rev.9.0_01

S-8520/8521 Series

1. 3 Overload protection circuit

Types are selectable the S-8520/8521 Series with the overload protection circuit (A, C and E types) or without

the overload protection circuit (B, D and F types).

By the S-8520/8521 Series with the overload protection circuit (A, C and E types), the switching components

and inductor can be protected because the overload protection circuit works and is set to the intermittent mode,

in case of overload or load short-circuit.

But in case of supplying current to load by using 100% duty cycle, select the S-8520/8521 Series without the

overload protection circuit (B, D and F types), according to the conditions of application.

The operation voltage differs in 10 V (A, B and E types) or 16 V (B, D and F types) whether the overload

protection circuit is available or not.

Table 9 shows items for selecting the type according to the requirements of application. Select it matching the

marks () for your requirement.

Table 9

Item

S-8520 Series

S-8521 Series

The need of overload protection circuit



Input voltage exceeds 10 V



Focusing on efficiency of light load status

(1 mA or less)





 



 



Using with middle load current (about 200

mA)











 



Using with large load current (about 1 A)







 





Focusing on the low ripple voltage









 





Focusing on downsizing external parts









Remark



: Indispensable condition



: Superiority of requirement



: Particularly superiority of requirement

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