Joulwatt EV5018 S1 R0 User manual

EV5018_S1_R0
600mA, 40V Synchronous
Step-Down Converter Ev lu tion Bo rd
Parameters
Parameters Parameters
Parameters Subject to Change
Subject to ChangeSubject to Change
Subject to Change Without Notice
Without NoticeWithout Notice
Without Notice
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nauthorized Photocopy and Duplication Prohibited.
FEATURES
 4.7V to 40V operating input range
600mA output current
 p to 93%efficiency
 Internal Soft-Start
 1.1MHz switching frequency
 FCC at light load
 Input under voltage lockout
 Available in SOT23-6package
 Current run-away protection
 Short circuit protection
 Thermal protection
APPLICATIONS
 Distributed Power Systems
 Automotive Systems
 High Voltage Power Conversion
 Industrial Power Systems
 Battery Powered Systems
DESCRIPTION
The JW5018 is a current mode monolithic buck
switching regulator. Operating with an input range
of 4.7V~40V, the JW5018 delivers 1A of
continuous output current with two integrated
N-Channel MOSFETs. The internal synchronous
power switches provide high efficiency without
the use of an external Schottky diode. At light
loads, the regulator operates in continual
conduction to maintain low output ripples. Current
mode control provides tight load transient
response and cycle-by-cycle current limit.
The JW5018 guarantees robustness with
short-circuit protection, thermal protection,
current run-away protection, and input under
voltage lockout.
ELECTRICAL SPECIFICATIONS
Parameter Symbol Value nit
Input Voltage VIN 7.5~40 V
Output Voltage VO T 5 V
Output Current IO T 0~0.6 A
EVALUATION BOARD AND TYPICAL PERFORMANCE
0
10
20
30
40
50
60
70
80
90
100
0 200 400 600 800 1000
Efficiency
（
（（
（
%
）
））
）
Io(mA)
Efficiency
Vin=8V
Vin=12V
Vin=24V

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SCHEMATIC
BILL OF MATERIALS
Qty Design tor V lue Description P ck ge M nuf cturer
M nuf cturer
P/N
1 C0 47uF Electrolytic capacitor
50V
RB.1/.2
1 C1 100nF Ceramic capacitor
50V ,X7R
0603C
SAMS NG
CL10B104KO8N
NNC
1 C2 4.7uF Ceramic capacitor
50V ,X7R
1206C
SAMS NG
CL31B475KBHN
NNE
1 C3 10uF Ceramic capacitor
16V ,X7R
1210C
0 C4 NC
1 L1 4.7uH/2.9A Inductor 7332 WE
7447789004
1 R1 100k Resistor,5% 0603R niohm 0603J0104T5E
1 R2 100k Resistor,5% 0603R niohm 0603J0104T5E
1 R3 11.2k Resistor,1% 0603R niohm 0603F1122T5E
1 R4 2.1k Resistor,1% 0603R niohm 0603F2101T5E
1 R5 0Ω Resistor,5% 0603R niohm 0603J0000T5E

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Qty Design tor V lue Description P ck ge M nuf cturer
M nuf cturer
P/N
1 VIN 7.5V~40V TEST-Pol
e
1 VO T 5V/600mA TEST-Pol
e
1 JW5018 40V/600mA Buck SOT23-6 Joulwatt JW5018

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nauthorized Photocopy and Duplication Prohibited.
PRINTED CIRCUIT BOARD LAYEROUT
Figure1—
——
—Top Layer Figure2—
——
—Bottom Layer
Figure3—
——
—Sil Layer
Figure4—
——
—Sil Layer
QUICK START GUIDE
1. Connect the positive termin l nd neg tive termin l of the lo d to Vout nd GND of
EVB, respectively.
2. Connect power supply between VIN nd GND with the supply in “OFF” st te. Set
the output volt ge of the power supply to 7.5V~40V.
3. Turn on the power supply nd the ev lu tion bo rd st rts oper ting in norm l
condition.
4. The output volt ge c n be djusted by v rying the R3 nd R4 on EVB.
For ex mple：
：：
：Fixed R4 to2.1K,when djusting the output volt ge to 5V，
，，
，
R3=Vout/0.8*R4-R4.
5. For more inform tion, ple se refer to the d t sheet ofJW5018.

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TYPICAL PERFORMANCE CHARACTERISTICS
Vin = 12V, Vout = 5V, L = 4.7µH, Cout = 10µF, TA = +25°C, unless otherwise noted
S
teady State
Test
VIN=12V, Vout=5V
Iout=600mA
S
tartup through Enable
VIN=12V, Vout=5V
Iout=600mA(Resistive load
S
hutdown through Enable
VIN=12V, Vout=5V
Iout=600mA(Resistive load
H
eavy Load Operation
600mA LOAD
M
edium Load Operation
300mA LOAD
L
ight Load Operation
0 A LOAD
S
hort Circuit
P
rotection
VIN=12V, Vout=5V
Iout=600mA- Short
S
hort Circuit
Recovery
VIN=12V, Vout=5V
Iout= Short-600mA
Load Transient
300mA LOAD → 600mA LOAD
→ 300mA LOAD

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IMPORTANT NOTICE
 Joulw tt Technology Inc. reserves the right to m ke modific tions, enh ncements, improvements,
corrections or other ch nges without further notice to this document nd ny product described herein.
 Any un uthorized redistribution or copy of this document for ny purpose is strictly forbidden.
 Joulw tt Technology Inc. does not w rr nt or ccept ny li bility wh tsoever in respect of ny products
purch sed through un uthorized s les ch nnel.
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