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LM5118EVAL/NOPB 其他数据使用手册 - TI（德州仪器）
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TI（德州仪器）
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开发板
描述:
Evaluation Board for the LM5118 Wide Input 5V to 75V Buck-Boost ControllerThe LM5118 Evaluation Board is designed to provide the design engineer with a fully functional, Emulated Current Mode Control, buck-boost power converter The board provides a 12V output with 3A of output current capability Wide input voltage range from 5 to 75V, with operation down to 3V with some component changes Operates at 300kHz, a good compromise between conversion efficiency, tradeoffs between buck and buck-boost mode requirements, and converter size Single inductor architecture Programmable soft-start Ultra low (Enable input Thermal Shutdown ### 直流/直流控制器（外部开关），Texas Instruments展开
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LM5118EVAL/NOPB数据手册
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May 19, 2008
LM5118
Wide Voltage Range Buck-Boost Controller
General Description
The LM5118 wide voltage range Buck-Boost switching regu-
lator controller features all of the functions necessary to im-
plement a high performance, cost efficient Buck-Boost
regulator using a minimum of external components. The
Buck-Boost topology maintains output voltage regulation
when the input voltage is either less than or greater than the
output voltage making it especially suitable for automotive
applications. The LM5118 operates as a buck regulator while
the input voltage is sufficiently greater than the regulated out-
put voltage and gradually transitions to the buck-boost mode
as the input voltage approaches the output. This dual mode
approach maintains regulation over a wide range of input
voltages with optimal conversion efficiency in the buck mode
and a glitch-free output during mode transitions. This easy to
use controller includes drivers for the high side buck MOSFET
and the low side boost MOSFET. The regulator’s control
method is based upon current mode control utilizing an em-
ulated current ramp. Emulated current mode control reduces
noise sensitivity of the pulse-width modulation circuit, allow-
ing reliable control of the very small duty cycles necessary in
high input voltage applications. Additional protection features
include current limit, thermal shutdown and an enable input.
The device is available in a power enhanced TSSOP-20
package featuring an exposed die attach pad to aid thermal
dissipation.
Features
■
Ultra-wide input voltage range from 3V to 75V
■
Emulated peak current mode control
■
Smooth transition between step-down and step- up modes
■
Switching frequency programmable to 500KHz
■
Oscillator synchronization capability
■
Internal high voltage bias regulator
■
Integrated high and low-side gate drivers
■
Programmable soft-start time
■
Ultra low shutdown current
■
Enable input wide bandwidth error amplifier
■
1.5% feedback reference accuracy
■
Thermal shutdown
Package
TSSOP-20EP (Exposed pad)
Typical Application Circuit
30058501
© 2008 National Semiconductor Corporation 300585 www.national.com
LM5118 Wide Voltage Range Buck-Boost Controller
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