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LM2736 bảng dữ liệu(PDF) 8 Page - Texas Instruments

tên linh kiện LM2736
Giải thích chi tiết về linh kiện  Thin SOT23 750mA Load Step-Down DC-DC Regulator
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LM2736 bảng dữ liệu(HTML) 8 Page - Texas Instruments

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0
0
VIN
VD
TON
t
t
Inductor
Current
D = TON/TSW
VSW
TOFF
TSW
IL
IPK
SW
Voltage
LM2736
SNVS316E – SEPTEMBER 2004 – REVISED SEPTEMBER 2011
www.ti.com
Application Information
THEORY OF OPERATION
The LM2736 is a constant frequency PWM buck regulator IC that delivers a 750mA load current. The regulator
has a preset switching frequency of either 550kHz (LM2736Y) or 1.6MHz (LM2736X). These high frequencies
allow the LM2736 to operate with small surface mount capacitors and inductors, resulting in DC/DC converters
that require a minimum amount of board space. The LM2736 is internally compensated, so it is simple to use,
and requires few external components. The LM2736 uses current-mode control to regulate the output voltage.
The following operating description of the LM2736 will refer to the Simplified Block Diagram (Figure 3) and to the
waveforms in Figure 4. The LM2736 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 4. LM2736 Waveforms of SW Pin Voltage and Inductor Current
BOOST FUNCTION
Capacitor CBOOST and diode D2 in Figure 5 are used to generate a voltage VBOOST. VBOOST - VSW is the gate drive
voltage to the internal NMOS control switch. To properly drive the internal NMOS switch during its on-time,
VBOOST needs to be at least 1.6V greater than VSW. Although the LM2736 will operate with this minimum voltage,
it may not have sufficient gate drive to supply large values of output current. Therefore, it is recommended that
VBOOST be greater than 2.5V above VSW for best efficiency. VBOOST – VSW should not exceed the maximum
operating limit of 5.5V.
5.5V > VBOOST – VSW > 2.5V for best performance.
8
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Product Folder Links: LM2736


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