NCP1252ADR2G
| Parameters | |
|---|---|
| Series | - |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| RoHS Status | ROHS3 Compliant |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mfr | onsemi |
| Mounting Type | Surface Mount |
| Operating Temperature | -25°C ~ 125°C (TJ) |
| Voltage - Breakdown | - |
| Supplier Device Package | 8-SOIC |
| Fault Protection | Current Limiting |
| Topology | Flyback, Forward |
| Voltage - Supply (Vcc/Vdd) | 9V ~ 28V |
| Control Features | Frequency Control, Soft Start |
| Frequency - Switching | Up to 500kHz |
| Internal Switch(s) | No |
| Voltage - Start Up | 10 V |
| Duty Cycle | 48% |
| Output Isolation | Isolated |
| Package | Tape & Reel (TR) |
| Product Status | Active |
| Base Product Number | NCP1252 |
| REACH Status | REACH Unaffected |
| Standard Package | 2,500 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
NCP1252ADR2G current mode PWM controller Up to 500kHz
The NCP1252ADR2G from onsemi is a highly integrated, fixed-frequency current-mode PWM controller engineered for robust AC-DC power conversion in flyback and forward topologies. Housed in a compact SOIC-8 package, this controller is a cost-optimized solution for building reliable offline switchers, particularly targeting ATX silver box power supplies and high-volume consumer adapters. It operates over a wide Vcc range of 9 V to 28 V and supports adjustable switching frequencies up to 500 kHz, enabling designers to balance efficiency and component size. A key innovation is its use of an internal fixed timer for output overload detection, which eliminates dependency on the auxiliary winding voltage for fault sensing, enhancing reliability. With built-in protections including brown-out detection, auto-recovery UVLO, and latched over-current protection, it ensures system safety while minimizing external component count.
Key Features & Benefits
The NCP1252ADR2G is packed with features that streamline design and enhance performance. It employs ±5% frequency jittering to spread EMI emissions, significantly easing compliance with regulatory standards. The controller offers strong gate drive capability with 500 mA source and 800 mA sink currents, ensuring fast switching of power MOSFETs to reduce switching losses. For system robustness, it integrates 160 ns leading-edge blanking to prevent false triggering during current sense, adjustable soft-start to manage inrush current, and internal ramp compensation to prevent sub-harmonic oscillations. This combination of high drive strength, advanced protection, and EMI mitigation makes it a versatile choice for demanding power environments.
Alternative PWM controllers
● UC2843BD1G (onsemi): A classic industry-standard current-mode PWM controller offering wide supply voltage (7.6V-30V) and 250 kHz operation, ideal for direct replacements in legacy designs.
● TEA1733LT (NXP): A green-chip controller optimized for low standby power (<100mW) in flyback converters, featuring frequency foldback and robust protection for adapter applications.
● TNY280PN (Power Integrations): An integrated switcher combining a 700V MOSFET and controller in one package, drastically reducing component count for ultra-compact under 15W designs.
● NCP1244 (onsemi): A member of the same family with enhanced auto-recovery short-circuit protection and frequency foldback, tailored for improved standby performance.
