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L5107L-P16-R Datasheet(PDF) 7 Page - Unisonic Technologies |
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L5107L-P16-R Datasheet(HTML) 7 Page - Unisonic Technologies |
7 / 9 page L5107 Preliminary LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 7 of 9 www.unisonic.com.tw QW-R125-026.A POWER TOPOLOGY(Cont.) Output Over Voltage Protection (OVP) The UTC L5107 provides an OVP circuitry with a reference value of 1.25V in order to protect the system from an over voltage fault condition. This OVP point can be programmed through the use of external resistors (R1 and R2 in Figure 2). This OVP voltage can be calculated using Equation 3: Eq. (3) 2 2 1 OVP R ) R (R 1.25 V Current Limit The UTC L5107 features a current limit protection feature to prevent any current runaway conditions. The current limit circuitry monitors current on a pulse by pulse basis. It limits the current through the inductor by sensing the voltage across RCS. When 0.45V is present at the IS pin, the pulse is truncated. The next pulse continues as normally until the IS pin reaches 0.45V and it is truncated once again. This will continue until the output load is decreased. Select RCS using Equation 4: Eq. (4) PK_LIMIT MIN MAX L SW IN OUT CS I F L D V - V 0.45 R Slope Compensation The UTC L5107 requires slope compensation for the peak current mode controller. The UTC L5107 uses an external resistor, RSLC for slope compensation. The ability to set the proper slope compensation through the use of a single external component results in design flexibility. Select RSLC using Equation 5: Eq. (5) SW CS IN OUT SLC F Α 250 L R V V R MIN MAX μ |
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