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RT7257G Datasheet(PDF) 3 Page - Richtek Technology Corporation |
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RT7257G Datasheet(HTML) 3 Page - Richtek Technology Corporation |
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3 / 15 page  RT7257G 3 DS7257G-01 September 2012 www.richtek.com © Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. Function Block Diagram VA + - + - + - UV Comparator Oscillator Foldback Control 0.4V Internal Regulator + - 2.5V Shutdown Comparator Current Sense Amplifier BOOT VIN GND SW FB EN COMP VA VCC 6µA Slope Comp Current Comparator + - EA 0.8V S R Q Q SS + - 1.2V Lockout Comparator VCC + Ω 90m Ω 110m 5k Ω RSENSE Operation Shutdown Comparator Activate internal regulator once EN input level is larger than the target level. Force IC to enter shutdown mode when the EN input level is lower than 0.4V. Internal Regulator Provide internal power for logic control and switch gate drivers. Lockout Comparator Activate the current comparator, release lock-out logic, and enable the switches as EN input level is larger than lockout voltage. Otherwise, the switches still locks out. Oscillator The oscillator provides internal clock and controls the converter's switching frequency. Foldback Control Dynamically adjust the internal clock. It provides a slower frequency as a lower FB voltage. UV Comparator As FB voltage is lower than the UV voltage, it will activate a UV protect scheme. Error Amplifier The output voltage COMP of the error amplifier is adjusted comparing FB signal with the internal reference voltage and SS signal. Current Sense Amplifier RSENSE detects the peak current of the high side switch. This signal is amplified by the current sense amplifier and added with a slope compensation signal. Then, It controls the switches by comparing this signal with the COMP voltage. |
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