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LM2734 데이터시트(PDF) 8 Page - Texas Instruments

부품명 LM2734
상세설명  LM2734 Thin SOT 1-A Load Step-Down DC-DC Regulator
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LM2734 데이터시트(HTML) 8 Page - Texas Instruments

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background image
0
0
VIN
VD
TON
t
t
Inductor
Current
D = TON/TSW
VSW
TOFF
TSW
IL
IPK
SW
Voltage
LM2734
SNVS288J – SEPTEMBER 2004 – REVISED DECEMBER 2014
www.ti.com
7 Detailed Description
7.1 Overview
The LM2734 device is a constant frequency PWM buck regulator IC that delivers a 1-A load current. The
regulator has a preset switching frequency of either 550 kHz (LM2734Y) or 1.6 MHz (LM2734X). These high
frequencies allow the LM2734 device to operate with small surface-mount capacitors and inductors, resulting in
DC-DC converters that require a minimum amount of board space. The LM2734 device is internally
compensated, so it is simple to use, and requires few external components. The LM2734 device uses current-
mode control to regulate the output voltage.
The following operating description of the LM2734 device will refer to the Simplified Block Diagram () and to the
waveforms in Figure 12. The LM2734 device supplies a regulated output voltage by switching the internal NMOS
control switch at constant frequency and variable duty cycle. A switching cycle begins at the falling edge of the
reset pulse generated by the internal oscillator. When this pulse goes low, the output control logic turns on the
internal NMOS control switch. During this on-time, the SW pin voltage (VSW) swings up to approximately VIN, and
the inductor current (IL) increases with a linear slope. IL is measured by the current-sense amplifier, which
generates an output proportional to the switch current. The sense signal is summed with the regulator’s
corrective ramp and compared to the error amplifier’s output, which is proportional to the difference between the
feedback voltage and VREF. When the PWM comparator output goes high, the output switch turns off until the
next switching cycle begins. During the switch off-time, inductor current discharges through Schottky diode D1,
which forces the SW pin to swing below ground by the forward voltage (VD) of the catch diode. The regulator
loop adjusts the duty cycle (D) to maintain a constant output voltage.
Figure 12. LM2734 Waveforms of SW Pin Voltage and Inductor Current
8
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