Datenblatt-Suchmaschine für elektronische Bauteile |
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SS32 Datenblatt(PDF) 4 Page - Monolithic Power Systems |
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SS32 Datenblatt(HTML) 4 Page - Monolithic Power Systems |
4 / 11 page MP1591 – 2A, 32V, 330KHz STEP-DOWN CONVERTER MP1591 Rev. 2.3 www.MonolithicPower.com 4 9/27/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. © 2006 MPS. All Rights Reserved. OPERATION The MP1591 is a current mode step-down regulator. It regulates input voltages from 6.5V to 32V down to an output voltage as low as 1.230V and is able to supply up to 2A of load current. The MP1591 uses current-mode control to regulate the output voltage. The output voltage is measured at FB through a resistive voltage divider and amplified through the internal error amplifier. The output current of the transconductance error amplifier is presented at COMP where a network compensates the regulation control system. The voltage at COMP is compared to the switch current measured internally to control the output voltage. The converter uses an internal N-Channel MOSFET switch to step-down the input voltage to the regulated output voltage. Since the MOSFET requires a gate voltage greater than the input voltage, a boost capacitor connected between SW and BS drives the gate. The capacitor is internally charged while SW is low. An internal 10Ω switch from SW to GND is used to insure that SW is pulled to GND when the switch is off to fully charge the BS capacitor LOCKOUT COMPARATOR ERROR AMPLIFIER FREQUENCY FOLDBACK COMPARATOR INTERNAL REGULATORS 1.8V SLOPE COMP CLK CURRENT COMPARATOR CURRENT SENSE AMPLIFIER SHUTDOWN COMPARATOR COMP IN 2 EN 7 5 6 GND 4 OSCILLATOR THERMAL PROTECTION 35/330KHz S R Q SW BS M1 M2 1 + REF 5V 8 Q 1.2V + + 2.60V/ 2.35V + 1.230V 0.7V + + FB -- -- -- -- -- -- 3 Figure 1—Functional Block Diagram |
Ähnliche Teilenummer - SS32 |
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Ähnliche Beschreibung - SS32 |
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