ZHCSIK5C July 2018 – July 2019 LM5180
ADVANCE INFORMATION for pre-production products; subject to change without notice.
The required input, output, and performance parameters for this application example are shown in Table 5.
| DESIGN PARAMETER | VALUE |
|---|---|
| Input voltage range (steady state) | 8.5 V to 65 V |
| Output 1 voltage and current | 24 V, 0.1 A |
| Output 2 voltage and current | 5 V, 0.3 A |
| Input UVLO thresholds | 8 V on, 7 V off |
| Output voltage regulation | ±2% |
The target full-load efficiency of this LM5180 design is 88% based on a nominal input voltage of 24 V and isolated output voltages of 24 V and 5 V. The selected flyback converter components are cited in Table 6, including multi-winding flyback transformer, input and output capacitors, rectifying diodes, and converter IC.
| REF DES | QTY | SPECIFICATION | VENDOR | PART NUMBER |
|---|---|---|---|---|
| CIN | 1 | 2.2 µF, 100 V, X7R, 1210, ceramic | TDK | C3225X7S2A475M |
| Taiyo Yuden | HMK325B7225MM-T | |||
| 2.2 µF, 100 V, X7S, 1206, ceramic | TDK | C3216X7S2A225K160AB | ||
| Taiyo Yuden | HMK316AC7225KL-TE | |||
| Murata | GCM31CC72A225KE02 | |||
| COUT1 | 1 | 10 µF, 50 V, X7R, 1210, ceramic | Taiyo Yuden | UMK325AB7106MM-T |
| 10 µF, 50 V, X7S, 1210, ceramic | TDK | C3225X7R1H106M | ||
| COUT2 | 1 | 47 µF, 10 V, X7R, 1210, ceramic | Murata | GRM32ER71A476ME15L |
| DFLY1 | 1 | Switching diode, fast recovery, 200 V, 1 A, SOD-123 | DFLU1200 | Diodes Inc. |
| DFLY2 | 1 | Schottky diode, 40 V, 1 A, SOD-123 | B140HW | Diodes Inc. |
| DCLAMP | 1 | Zener, 22 V, 1 W, PowerDI-123 | DFLZ22-7 | Diodes Inc. |
| DF | 1 | Switching diode, 75 V, 0.25 A, SOD-323 | CMDD4448 | Central Semi |
| DOUT1 | 1 | Zener, 27 V, 2%, SOD-523 | BZX585-B27 | Nexperia |
| DOUT2 | 1 | Zener, 5.6 V, 2%, SOD-523 | BZX585-B5V6 | Nexperia |
| RFB | 1 | 130 kΩ, 1%, 0402 | Std | Std |
| RSET | 1 | 12.1 kΩ, 1%, 0402 | Std | Std |
| RTC | 1 | 301 kΩ, 1%, 0402 | Std | Std |
| RUV1 | 1 | 147 kΩ, 1%, 0603 | Std | Std |
| RUV2 | 1 | 34 kΩ, 1%, 0402 | Std | Std |
| T1 | 1 | 30 µH, 2 A, turns ratio 1 : 1.5 : 0.4, 9 × 10 mm, SMT | Coilcraft | YA8864-BLD |
| 30 µH, 2 A, turns ratio 1 : 1 : 0.55, 9 × 10 mm, SMT | Coilcraft | YA8916-BLD | ||
| Würth Electronik | 750317595 | |||
| U1 | 1 | LM5180 PSR flyback converter, VSON-8 | Texas Instruments | LM5180NGUR |