SNVSB79B November 2018 – May 2020 LM25180
PRODUCTION DATA.
Refer to the PDF data sheet for device specific package drawings
The required input, output, and performance parameters for this application example are shown in Table 1.
DESIGN PARAMETER | VALUE |
---|---|
Input voltage range | 10 V to 36 V |
Input UVLO thresholds | 9.5 V on, 6.5 V off |
Output voltage | 5 V |
Rated load current, VIN = 24 V | 1 A |
Output voltage regulation | ±1.5% |
Output voltage ripple | < 100 mV |
The target full-load efficiency is 86% based on a nominal input voltage of 24 V and an isolated output voltage of 5 V. The LM25180 is chosen to deliver a fixed 5-V output voltage set by resistor RFB connected between the SW and FB pins. The input voltage turn-on and turn-off thresholds are established by RUV1 and RUV2. The required components are listed in Table 2. Transformers for other single-output designs are listed in Table 3.
REF DES | QTY | SPECIFICATION | VENDOR | PART NUMBER |
---|---|---|---|---|
CIN | 1 | 10 µF, 50 V, X7R, 1210, ceramic | Taiyo Yuden | UMK325AB7106KM-T |
COUT | 1 | 100 µF, 6.3 V, X7S, 1210, ceramic | Murata | GRM32EC70J107ME15 |
Taiyo Yuden | JMK325AC7107MM-P | |||
100 µF, 6.3 V, X5R, 1210, ceramic | TDK | C3225X5R0J107M250AC | ||
Würth Electronik | 885012109004 | |||
CSS | 1 | 47 nF, 16 V, X7R, 0402 | Std | Std |
DCLAMP | 1 | Zener, 24 V, 1 W, PowerDI-123 | DFLZ24-7 | 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 | 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 | 30 µH, 2 A, turns ratio 3 : 1, 9.3 × 10.2 mm | Coilcraft | YA8779-BL |
Würth Electronik | 750317605 | |||
30 µH, 2.6 A, turns ratio 3 : 1, 12.5 × 15.5 mm | Sumida | 12387-T151 | ||
40 µH, 2 A, turns ratio 3 : 1, 13.3 × 15.2 mm | Würth Electronik | 750313974 | ||
U1 | 1 | LM25180 PSR flyback converter, VSON-8 | Texas Instruments | LM25180NGUR |
OUTPUT VOLTAGE RANGE | TURNS RATIO | LMAG, ISAT | DIMENSIONS | VENDOR | PART NUMBER |
---|---|---|---|---|---|
4 V to 8 V | 2 : 1 | 30 µH, 2 A | 9.3 × 10.2 × 10.6 mm | Coilcraft | YA9033-AL |
8 V to 11 V | 1.5 : 1 | YA9034-AL | |||
12 V to 18 V | 1 : 1 | YA9035-AL | |||
18 V to 36 V | 1 : 2 | YA9036-AL | |||
36 V to 55 V | 1 : 3 | YA9037-AL |