Texas Instruments LM5146 Handleiding
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LM5146 100-V Synchronous Buck DC/DC Controller With Wide Duty Cycle Range
1 Features
•Functional Safety-Capable
–Documentation available to aid functional safety
system design
•Versatile synchronous buck DC/DC controller
–Wide input voltage range of 5.5 V to 100 V
–150°C maximum junction temperature
–0.8-V reference with ±1% feedback accuracy
–Adjustable output voltage from 0.8 V to 60 V
–40-ns t
ON(min)
for high V
IN
/ V
OUT
ratio
–140-ns t
OFF(min)
for low dropout
–Lossless R
DS(on)
or shunt current sensing
–Optimized for CISPR 11 and CISPR 32 Class B
EMI requirements
•Switching frequency from 100 kHz to 1 MHz
–SYNC in and SYNC out capability
–Selectable diode emulation or FPWM
•7.5-V gate drivers for standard V
TH
MOSFETs
–14-ns adaptive dead-time control
–2.3-A source and 3.5-A sink capability
•Fast line and load transient response
–Voltage-mode control with line feedforward
–High gain-bandwidth error amplifier
•Inherent protection features for robust design
–Adjustable output voltage soft start
–Hiccup-mode overcurrent protection
–Input UVLO with hysteresis
–VCC and gate-drive UVLO protection
–Precision enable input and open-drain PGOOD
indicator for sequencing and control
–Thermal shutdown protection with hysteresis
•20-pin VQFN package with wettable flanks
•Create a custom design using the LM5146 with
WEBENCH
®
Power Designer
2 Applications
•Wireless infrastructure, cloud computing
•Industrial motor drives, test and measurement
•Personal transport vehicle: electric bike
•Asset tracking and fleet management systems
•Non-isolated PoE, IP cameras
•Inverting buck-boost regulators
3 Description
The LM5146 100-V synchronous buck controller
regulates from a high input voltage source or from an
input rail subject to high-voltage transients, minimizing
the need for external surge suppression components.
A high-side switch minimum on-time of 40 ns gives
large step-down ratios, enabling the direct step-down
conversion from a 48-V nominal input to low-voltage
rails for reduced system complexity and solution cost.
The LM5146 continues to operate during input voltage
dips as low as 5.5 V, at nearly 100% duty cycle
if needed, making it an excellent choice for high-
performance industrial controls, robotics, datacom,
and RF applications.
Forced-PWM (FPWM) operation eliminates switching
frequency variation to minimize EMI, while
user-selectable diode emulation lowers current
consumption at light-load conditions. The adjustable
switching frequency as high as 1 MHz can be
synchronized to an external clock source to eliminate
beat frequencies in noise-sensitive applications.
Device Information
PART NUMBERPACKAGE
(1)
BODY SIZE (NOM)
LM5146VQFN (20)4.50 mm × 3.50 mm
(1)For all available packages, see the orderable addendum at
the end of the data sheet.
BST
HO
SW
VCC
PGND
RT
SS/TRK
COMP
FB
AGND
V
IN
V
OUT
LM5146
V
OUT
SYNC In
GND
PG
SYNCOUT
SYNCIN
EN/UVLOVIN
ILIM
PGOOD
SYNC Out
LO
L
F
C
OUT
Q
1
Q
2
C
IN
R
ILIM
C
VCC
C
BST
C
SS
R
FB2
R
FB1
R
C2
C
C2
C
C1
R
C1
C
C3
R
RT
ENV
IN
Typical Application Circuit and Efficiency Performance, V
OUT
= 12 V, F
SW
= 400 kHz
LM5146
SNVSBV0A – JUNE 2021 – REVISED JUNE 2021
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | LM5146 |
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