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CEP1311D-2405051R-10 Datasheet(PDF) 3 Page - Rohm |
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CEP1311D-2405051R-10 Datasheet(HTML) 3 Page - Rohm |
3 / 31 page 3/27 Datasheet Datasheet BD7F200HFN-LB BD7F200EFJ-LB TSZ02201-0J1J0AZ01220-1-2 © 2016 ROHM Co., Ltd. All rights reserved. 24.Mar.2016 Rev.002 www.rohm.com TSZ22111・15・001 Block Diagram FB SW DRIVER ADAPTIVE ON-TIME CONTROLLER VREF SOFT START COMPARATOR VIN INTERNAL REGULATOR SDX/EN LOAD COMPENSATION VIN UVLO PGND COMP REF AGND N-Channel MOSFET Shutdown OCP TSD Enable VREF Current Monitor Description of Blocks 1. INTERNAL REGULATOR This is the regulator block for internal circuits. Also includes a reference voltage generating block (VREF). This block is in the shutdown state when the SDX/EN terminal is below 0.9V (Typ). 2. VIN UVLO This is the input low-voltage-protection block. If the power supply input voltage, VIN, falls to below 6.2V (Typ), it will be detected and this block will be in the protection state and the SW terminal becomes Hi-Z. When the power supply input voltage (VIN) rises to 6.9V (Typ), it automatically recovers thorough the soft start. (Hysteresis voltage: 0.7V (Typ).) 3. SOFT START When the SDX/EN terminal is in the enable state with more than 2.0V (Typ), this block prevents inrush current and overshoot in the rising of the output voltage by making the reference voltage of the COMPARATOR block rise slowly from 0V to VREF voltage. The default soft start time, tSS, is designed to be 6ms (Typ) internally. The min off time is 750ns (Typ) when the output voltage is below 50% of the set voltage. 4. COMPARATOR This is the block which compares the reference voltage VREF with the REF terminal voltage which is the feedback voltage of the SW terminal voltage. Since the feedback loop is structured by a comparator is established, it has excellent response to load fluctuation. 5. ADAPTIVE ON-TIME CONTROLLER This is the block corresponding to the original adapted type ON-Time control technology. Switching frequency is fixed at 400kHz (Typ) under PWM Control when the load is stable. Under On-Time Control, when the load varies, fast load response is enabled by changing the switching frequency. During light load, the highly efficient PFM will operate and the self-power dissipation is suppressed by decreasing the switching frequency. 6. DRIVER This is the block which drives the built-in N-Channel MOSFET. |
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