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LM2671 Datasheet(PDF) 11 Page - Texas Instruments

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Part No. LM2671
Description  LM2671 SIMPLE SWITCHER짰 Power Converter High Efficiency 500-mA Step-Down Voltage Regulator With Features
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM2671 Datasheet(HTML) 11 Page - Texas Instruments

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11
LM2671
www.ti.com
SNVS008L – SEPTEMBER 1998 – REVISED JUNE 2016
Product Folder Links: LM2671
Submit Documentation Feedback
Copyright © 1998–2016, Texas Instruments Incorporated
Feature Description (continued)
8.3.2 Input
The input voltage for the power supply is connected to the VIN pin. In addition to providing energy to the load the
input voltage also provides bias for the internal circuitry of the LM2671. For ensured performance the input
voltage must be in the range of 6.5 V to 40 V. For best performance of the power supply the VIN pin must always
be bypassed with an input capacitor placed close to this pin and GND.
8.3.3 C Boost
A capacitor must be connected from the CB pin to the VSW pin. This capacitor boosts the gate drive to the internal
MOSFET above VIN to fully turn it ON. This minimizes conduction losses in the power switch to maintain high
efficiency. The recommended value for C Boost is 0.01 μF.
8.3.4 Ground
This is the ground reference connection for all components in the power supply. In fast-switching, high-current
applications such as those implemented with the LM2671, TI recommends that a broad ground plane be used to
minimize signal coupling throughout the circuit.
8.3.5 Sync
This input allows control of the switching clock frequency. If left open-circuited the regulator is switched at the
internal oscillator frequency, typically 260 kHz. An external clock can be used to force the switching frequency
and thereby control the output ripple frequency of the regulator. This capability provides for consistent filtering of
the output ripple from system to system as well as precise frequency spectrum positioning of the ripple frequency
which is often desired in communications and radio applications. This external frequency must be greater than
the LM2671 internal oscillator frequency, which could be as high as 275 kHz, to prevent an erroneous reset of
the internal ramp oscillator and PWM control of the power switch. The ramp oscillator is reset on the positive
going edge of the sync input signal. TI recommends that the external TTL or CMOS compatible clock (between
0 V and a level greater than 3 V) be ac coupled to the SYNC pin through a 100-pF capacitor and a 1-kΩ resistor
to ground.
When the SYNC function is used, current limit frequency foldback is not active. Therefore, the device may not be
fully protected against extreme output short-circuit conditions.
8.3.6 Feedback
This is the input to a two-stage high gain amplifier, which drives the PWM controller. Connect the FB pin directly
to the output for proper regulation. For the fixed output devices (3.3-V, 5-V and 12-V outputs), a direct wire
connection to the output is all that is required as internal gain setting resistors are provided inside the LM2671.
For the adjustable output version two external resistors are required to set the DC output voltage. For stable
operation of the power supply it is important to prevent coupling of any inductor flux to the feedback input.
8.3.7 ON/OFF
This input provides an electrical ON/OFF control of the power supply. Connecting this pin to ground or to any
voltage less than 0.8 V is completely turn OFF the regulator. The current drain from the input supply when OFF
is only 50 μA. The ON/OFF input has an internal pullup current source of approximately 20 μA and a protection
clamp Zener diode of 7 V to ground. When electrically driving the ON/OFF pin the high voltage level for the ON
condition must not exceed the 6 V absolute maximum limit. When ON/OFF control is not required this pin must
be left open.
8.4 Device Functional Modes
8.4.1 Shutdown Mode
The ON/OFF pin provides electrical ON and OFF control for the LM2671. When the voltage of this pin is lower
than 1.4 V, the device enters shutdown mode. The typical standby current in this mode is 50 μA.


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