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LM5181-Q1 Datenblatt(PDF) 17 Page - Texas Instruments

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Teilenummer LM5181-Q1
Bauteilbeschribung  LM5181-Q1 65-VIN PSR Flyback DC/DC Converter with 100-V, 0.75-A Integrated MOSFET
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SNVSBN6 – APRIL 2020
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Copyright © 2020, Texas Instruments Incorporated
9.2.1.1 Design Requirements
The required input, output, and performance parameters for this application example are shown in Table 1.
Table 1. Design Parameters
DESIGN PARAMETER
VALUE
Input voltage range
10 V to 65 V
Input UVLO thresholds
9.5 V on, 6.5 V off
Output voltage
5 V
Rated load current, VIN = 24 V
0.5 A
Output voltage regulation
±1.5%
Output voltage ripple
< 100 mV
The target full-load efficiency is 87.5% based on a nominal input voltage of 24 V and an isolated output voltage
of 5 V. The LM5181-Q1 is chosen to deliver a fixed 5-V output voltage set by resistor RFB connected between the
SW and FB pins. The input voltage turnon and turnoff thresholds are established by RUV1 and RUV2. The required
components are listed in Table 2. Transformers for other designs are listed in Table 3.
Table 2. List of Components for Design 1
REF DES
QTY
SPECIFICATION
VENDOR
PART NUMBER
CIN
1
2.2 µF, 100 V, X7R, 1206, ceramic
AVX
12061C225K4T2A
2.2 µF, 100 V, X7R, 1210, ceramic, AEC-Q200
TDK
CGA6N3X7R2A225K230AB
Murata
GCJ32DR72A225KA01L
Taiyo Yuden
HMK325B7225KMHP
COUT
1
47 µF, 10 V, X7S, 1210, ceramic, AEC-Q200
TDK
CGA6P1X7S1A476M250AC
47 µF, 10 V, X7R, 1210, ceramic
Murata
GRM32ER71A476KE15L
Taiyo Yuden
LMK325B7476MM-TR
CSS
1
47 nF, 16 V, X7R, 0402
Std
Std
DCLAMP
1
Zener, 24 V, 1 W, PowerDI-123, AEC-Q101
DFLZ24Q-7
Diodes Inc.
DF
1
Switching diode, 75 V, 0.25 A, SOD-323
CMDD4448
Central Semi
DFLY
1
Schottky diode, 40 V, 2 A, SOD-123
FSV340FP
Onsemi
DOUT
1
Zener, 5.6 V, 5%, SOD-523, AEC-Q101
BZX585-C5V6
Nexperia
RFB
1
158 kΩ, 1%, 0402
Std
Std
RSET
1
12.1 kΩ, 1%, 0402
Std
Std
RTC
1
130 kΩ, 1%, 0402
Std
Std
RUV1
1
536 kΩ, 1%, 0603
Std
Std
RUV2
1
100 kΩ, 1%, 0402
Std
Std
T1
1
44 µH, 1.4 A, 3 : 1, 8.2 × 8.6 × 9.6 mm
Würth Electronik
750318633
U1
1
LM5181-Q1 PSR flyback converter, AEC-Q100, VSON-8
Texas Instruments
LM5181QNGURQ1
Table 3. Magnetic Components for Various Output Voltages
OUTPUT VOLTAGE (RANGE)
TURNS RATIO
LMAG, ISAT
DIMENSIONS
VENDOR
PART NUMBER
3.3 V (up to 4 V)
4 : 1
40 µH, 1 A
8.6 × 8.26 × 9.65 mm
Würth Electronik
750319117
5 V (4 V to 5.5 V)
3 : 1
44 µH, 1 A
750318633
12 V (5.5 V to 16 V)
1 : 1
750318737
24 V (16 V to 32 V)
1 : 2
750318738
48 V (32 V to 50 V)
1 : 3
750319118
15 V and –7.5 V dual
1 : 1.5 : 0.8
30 µH, 1 A
750319119


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