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S-8521E35MC-BLUT2x Datasheet(PDF) 16 Page - Seiko Instruments Inc |
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S-8521E35MC-BLUT2x Datasheet(HTML) 16 Page - Seiko Instruments Inc |
16 / 44 page STEP-DOWN, PWM CONTROL or PWM / PFM SWITCHABLE SWITCHING REGULATOR CONTROLLER S-8520/8521 Series Rev.9.0_01 16 Selection of Products and External Parts 1. Method for selecting series products The S-8520/8521 Series is classified into 12 types, according to the control systems (PWM control and PWM / PFM switching control), the different oscillation frequencies, and set-up of an overload protection circuit. Please select the type for your application according to the following features. 1. 1 Control systems Two different control systems are available: PWM control system (S-8520 Series) and PWM / PFM switching control system (S-8521 Series). For applications for which the load current greatly differs between standby and operation, if the efficiency during standby is important, applying the PWM/PFM switching system (S-8321 Series) realizes high efficiency during standby. For applications for which switching noise is critical, applying the PWM control system (S-8320 Series) whereby switching frequency does not change due to load current allows the ripple voltage to be easily suppressed by using a filter. 1. 2 Oscillation frequencies Either oscillation frequency, 180 kHz (A and B types), 60 kHz (C and D types), or 300 kHz (E and F types), can be selected. The A, B, E and F types have high oscillation frequency, how ripple voltage and excellent transient response characteristics. A small inductance can be used for these types because the peak current is low when inducing the same load current. Use of small output capacitors is effective for downsizing devices. The C and D types, whereby lower oscillation frequency realizes smaller self-consumption current, are highly efficient under light loads. In particular, the D type, when combined with a PWM/PFM switching control system, drastically improves the operation efficiency when the output load current is approximately 100 mA. |
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