Texas Instruments Evaluation Board for the LM21215 LM21215EVM/NOPB LM21215EVM/NOPB 数据表
产品代码
LM21215EVM/NOPB
FB
PGOOD
VIN
LM21215
VOUT
AGND
COMP
PVIN
ILIM
SW
EN
C6
L1
R
C1
C
C1
C
C2
C
C3
R
FB1
R
FB2
R
C2
PGND
AVIN
1
11-16
3
4
17
19
18
20
8,9,10
5,6,7
SS/
TRK
TRK
C
SS
2
eTSSOP-20
C7
C8
Vin
R
PG
C3
C4
C5
SS_TRK
R
AC
ENABLE
R
EN1
R
EN2
GND
GND
C9
PGOOD
SWITCH
AC INJ
VOUT
SENSE+
SENSE+
VOUT
SENSE-
SENSE-
VIN
SENSE-
VIN
SENSE+
V
IN
= 2.95V to 5.5V
V
OUT
= 1.2V, up to 15A
0.1
P
F
820 pF
165
:
10 k
:
49.9
:
10 k
:
9.31 k
:
1800 pF
68 pF
10 k
:
100
P
F
0.56
P
H
100
P
F
open
open
R1
1
1
:
C1
1
1
P
F
0.033
P
F
R
ILIM
0
:
User's Guide
SNVA476A – March 2011 – Revised May 2013
AN-2130 LM21215 Evaluation Board
1
Introduction
This evaluation board provides a solution to examine the high efficiency LM21215 buck switching
regulator. The LM21215 is capable of driving up to 15A of continuous load current with excellent output
voltage accuracy due to its ±1% internal reference. The LM21215 is capable of down converting from an
input voltage between 2.95V and 5.5V at a fixed switching frequency of 500 kHz. This device also features
an adjustable current limit that allows the user to set the internal current limit protection value. Other fault
protection features include output power good and output over-voltage protection. The dual function soft-
start/tracking pin can be used to control the startup response of the LM21215, and the precision enable
pin can be used to easily sequence the LM21215 in applications with sequencing requirements.
regulator. The LM21215 is capable of driving up to 15A of continuous load current with excellent output
voltage accuracy due to its ±1% internal reference. The LM21215 is capable of down converting from an
input voltage between 2.95V and 5.5V at a fixed switching frequency of 500 kHz. This device also features
an adjustable current limit that allows the user to set the internal current limit protection value. Other fault
protection features include output power good and output over-voltage protection. The dual function soft-
start/tracking pin can be used to control the startup response of the LM21215, and the precision enable
pin can be used to easily sequence the LM21215 in applications with sequencing requirements.
The LM21215 evaluation board has been optimized to work from 2.95V to 5.5V, achieving a balance
between overall solution size and regulator efficiency. The evaluation board measures just over 2” × 2” on
a four layer PCB, and exhibits a junction-to-ambient thermal impedance (
between overall solution size and regulator efficiency. The evaluation board measures just over 2” × 2” on
a four layer PCB, and exhibits a junction-to-ambient thermal impedance (
θ
JA
) of 24°C/W with no air flow.
The power stage and compensation components of the LM21215 evaluation board have been optimized
for an input voltage of 5V, but for testing purposes, the input can be varied across the entire operating
range. The output voltage of the evaluation board is nominally 1.2V, but this voltage can be easily
changed to any voltage between 0.6V and V
for an input voltage of 5V, but for testing purposes, the input can be varied across the entire operating
range. The output voltage of the evaluation board is nominally 1.2V, but this voltage can be easily
changed to any voltage between 0.6V and V
IN
by modifying the feedback resistor network.
2
Evaluation Board Schematic
Figure 1. Evaluation Board Schematic
All trademarks are the property of their respective owners.
1
SNVA476A – March 2011 – Revised May 2013
AN-2130 LM21215 Evaluation Board
Copyright © 2011–2013, Texas Instruments Incorporated