XC9110A451MR Просмотр технического описания (PDF) - TOREX SEMICONDUCTOR

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XC9110A451MR

PFM Controlled Step-Up DC/DC Converter / Controller ICs

TOREX SEMICONDUCTOR 

XC9110/XC9111

Series

■OPERATIONAL EXPLANATION

The XC9110/9111 series are PFM controlled step-up DC/DC converter (A, C and E types) / controller ICs (B, D and F

types), which contain voltage reference source, PFM comparator, duty selector, PFM controlled OSC, VLx Limiter, driver

transistor and so on. With the XC9110 series, maximum duty ratio is set to 75% (maximum oscillation

frequency=MAXFOSC: 100kHz) making it suitable for use with large current operations. The XC9111 series

automatically switches duty ratio between 56% (MAXFOSC: 180kHz) and 75% (MAXFOSC: 100kHz) when it senses

changes in load and can support both large and small currents.

<Reference Voltage Source (Vref) >

The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter.

< PFM Comparator >

The PFM comparator compares the feedback voltage divided by the internal split resistors with the internal reference

voltage. When the feedback voltage is higher than the reference voltage, PFM controlled OSC will be stopped. When

the feedback voltage is lower than the reference voltage, the PFM controlled OSC will be operated so that the output

voltage will be stable by sending a signal to the buffer drive circuit and controlling the internal or external driver transistor.

< Duty Selector >

With the XC9111 series, the duty selector automatically switches duty ratio between 56% and 75% when it senses

changes in load and can support both large and small currents.

< PFM Controlled Oscillator >

The PFM controlled OSC determines maximum oscillation frequency. The circuit generates the oscillation frequency of

100kHz at 75% duty and 180kHz at 56%.

< VLx Limiter>

The VLx circuit of the XC9110/9111 A, C and D types detects in-rush current and overcurrent, which flows from the VOUT

pin to the Lx pin during short-circuit. In overcurrent, the driver transistor will be OFF. When the overcurrent state is

eliminated, the IC resumes its normal operation.

<Chip Enable Function>

The chip enable function of the XC9110/9111 C and D types enables the IC to be in shut down mode when a low level

signal is input to the CE pin. During the shut down mode, the current consumption will be reduced to 0.5μA (MAX.).

<Separated VDD/VOUT>

With the separated VDD pin, the XC9110/9111 E and F types can be operated in both low and high voltage.

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