Renesas offers a wide selection of PWM controllers designed for switch-mode DC/DC and AC/DC power supplies requiring an isolation transformer, such as off-line AC/DC and -48V telecom-input DC/DC converters. Included in this broad controllers and converters portfolio are single-ended and double-ended isolated PWM controllers, as well as zero voltage switching (ZVS) full bridge controllers.
Use the following table to identify which products will best meet the needs of your next isolated power project:
| Topology Characteristic | Flyback | Forward (Two Switch) | Active Clamp Forward | Push-Pull | Half-Bridge | Full-Bridge ZVS | Full Bridge (Telecom) Hard SW |
|---|---|---|---|---|---|---|---|
| Recommended Power Level | <150W | 120W~200W | 120- 400W | 100W~500W | 150W~500W | >400W | >400W |
| Efficiency | Least ~70-80% | Moderate ~ 80-90% | High 85~92% | Moderate ~ 85-93% | High ~ 95%+ | High ~ 95%+ | High ~ 95%+ |
| Recommended Devices | ISL884x ISL672x | ISL672x | ISL6726 | ISL6741 | ISL674x | ISL675x | ISL674x |
| PFC Stage | ISL673x | ||||||
| Cost | Least | Low | Low | Low | Medium | High | High |
| Transfer Function = Vout/Vin | (Ns/Np)*D/(1-D) | (Ns/Np)*D | (Ns/Np)*D | 2*(Ns/Np)*D | (Ns/Np)*D | 2*(Ns/Np)*D | 2*(Ns/Np)*D |
| High Input Voltage | Good for bias supply | Good for 2-switch forward | Good | Not recommended | Good | Good | Good |
| Max. Duty Cycle | < 100% | < 50% (70% with active clamp) | 70% | < 50% each | < 50% each | < 50% each | < 50% each |
Family Values
- Full family features AC/DC solution with the smallest package
- Unique output current sensing scheme
- Unique brick wall OCP protection feature
- Unique full bridge zero voltage switching (ZVS) control scheme
- Optimized/Adjustable dead time control
Applications
- AC/DC power supply
- Brick convertor
- Power factor correction (PFC) board
- AC/DC Adapter
