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XCM406AA03DR Datasheet(PDF) 8 Page - Torex Semiconductor |
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XCM406AA03DR Datasheet(HTML) 8 Page - Torex Semiconductor |
8 / 20 page 8/20 XCM406 Series VOUT 0.8V ~ 1.45V 1.5V ~ 1.75V 1.8V ~ 5.0V CL ≧ 6.8μF ≧ 4.7μF ≧ 1.0μF ■ OPERATIONAL EXPLANATION The voltage, divided by resistors R1 & R2, which are connected to the VROUT pin is compared with the internal reference voltage by the error amplifier. The P-channel MOSFET connected to the VROUT pin is then driven by the subsequent output signal. The output voltage at the VOUT pin is controlled and stabilized by negative feedback. The constant current limit circuit and short circuit protection operate in relation to the level of output current. <Low ESR Capacitor> With the XCM406 series regulator, a stable output voltage is achievable even if low ESR capacitors are used, as a phase compensation circuit is built into the regulator. In order to ensure the effectiveness of the phase compensation, we suggest that an output capacitor (CL) will be connected as close as possible between the output pin (VROUT) and the VSS pin. Please use an output capacitor (CL) with a capacitance based on the chart below. We also suggest an input capacitor (CIN) of 1μF. This should be connected between VIN and VSS in order to stabilize input power source. Output Capacitor Corresponding Table <Current Limiter, Short-Circuit Protection> The XCM406 series regulator offers a combination of current limit and short circuit protection by means of a built-in fixed current limiter circuit and a foldback circuit. When drops further and output current decreases. When the output pin is shorted, a current of about 50mA flows. the load current reaches the current limit level, the fixed current limiter circuit operates and output voltage drops. As a result of this drop in output voltage, the foldback circuit operates, the output voltage <EN Pin> The IC's internal regulator circuitry can be shut down via the signal from the EN pin with the XC6210 series. In shutdown mode, output at the VROUT pin will be pulled down to the VSS level via R1 & R2. Options are available for the EN pin logic (See the product classification). Note that as the XCM406AA types are 'High Active / No Pull-Down', operations will become unstable with the EN pin open. Although the EN pin is equal to an inverter input with CMOS hysteresis, with either the pull-up or pull-down options, the CE pin input current will increase when the IC is in operation. We suggest that you use this IC with either a VIN voltage or a VSS voltage input at the EN pin. If this IC is used with the correct specifications for the EN pin, the IC will operate normally. However, supply current may increase as a result of through current in the IC's internal circuitry if a voltage other than VIN or VSS is applied. ■ NOTES ON USE 1. Please use this IC within the stated maximum ratings. For temporary, transitional voltage drop or voltage rising phenomenon, the IC is liable to malfunction should the ratings be exceeded. 2. Where wiring impedance is high, operations may become unstable due to noise and/or phase lag depending on output current. Please strengthen VIN and VSS wiring in particular. 3. Please wire the input capacitor (CIN) and the output capacitor (CL) as close to the IC as possible. When rapid input fluctuation or load fluctuation occurs, please increase the capacitor value such as CIN or CL to stabilize the operation. 4. The two dies in the same package are closely placed so that one heat generation affects the other. Heat dissipation should be evaluated on the actual board design before finalizing. In case of light load operation like 100μA below, but the other side is heavy load operation, the light load output voltage may happen to be elevated up to the input voltage level as a result of leakage current. As a counter measure when it happened, adding one resistor between VOUT and VSS pins is recommended. 5. Torex places an importance on improving our products and its reliability. However, by any possibility, we would request user fail-safe design and post-aging treatment on system or equipment. |
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