Overview
The NCL30125B2DR2G is a fixed-frequency current-mode controller produced by onsemi. This component is designed for use in two-switch forward converters and other DC-DC applications. It features the Dynamic Self-Supply (DSS) function, which simplifies the design of the auxiliary supply and the VCC capacitor by activating an internal startup current source during startup, transients, and standby modes. The controller operates with a supply range up to 35 V and includes adjustable switching frequency with jittering, peak current-mode control, and skip mode for efficient operation in light load conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Power Supply Voltage (Vcc) | -0.3 | - | 35 | V |
| Maximum Voltage on Low Power Pins (FB, BO, CS, RT, SS, Fault) | -0.3 | - | 5.5 | V |
| Switching Frequency | 46 | 92 | 300 | kHz |
| Maximum Duty Cycle | 43.0 | 45.0 | 48.0 | % |
| Internal IC Consumption (Steady State) | 1.8 | 2.2 | 3.3 | mA |
| Maximum Junction Temperature | - | - | 150 | °C |
| Storage Temperature Range | -60 | - | 150 | °C |
Key Features
- Integrated High-side Driver
- Adjustable Switching Frequency up to 300 kHz
- Peak Current-mode Control
- Skip Mode to Maximize Performance in Light Load Conditions
- High-voltage Current Source with Dynamic Self-Supply (DSS)
- Brown-out (BO) Detection
- Internal Slope Compensation
- Adjustable Soft-start Duration
- Frequency Jittering
- 15 ms Timer-based Short-circuit Protection with Auto-recovery or Latched Operation
- Auto-recovery or Latched OVP on VCC
- Latched OVP/OTP Input for Improved Robustness
- Internal Thermal Shutdown
- Pb-Free and RoHS Compliant
Applications
- Power Supplies for PC Silver Boxes and Game Adapters
- Two-Switch Forward Converter
- DC-DC Applications
Q & A
- What is the maximum operating voltage for the Vcc pin of the NCL30125B2DR2G?
The maximum operating voltage for the Vcc pin is 35 V.
- What is the adjustable switching frequency range of the NCL30125B2DR2G?
The switching frequency can be adjusted up to 300 kHz.
- What protection features does the NCL30125B2DR2G include?
The controller includes brown-out detection, overvoltage protection (OVP), overtemperature protection (OTP), and short-circuit protection.
- How does the Dynamic Self-Supply (DSS) function work?
The DSS function activates an internal startup current source to supply the controller during startup, transients, and standby modes, simplifying the design of the auxiliary supply and the VCC capacitor.
- What is the purpose of the skip mode in the NCL30125B2DR2G?
The skip mode maximizes performance in light load conditions by limiting the peak current and ensuring output voltage regulation and excellent efficiency.
- What is the maximum duty cycle of the NCL30125B2DR2G?
The maximum duty cycle is 48%.
- Is the NCL30125B2DR2G Pb-Free and RoHS Compliant?
Yes, the device is Pb-Free and RoHS Compliant.
- What is the maximum junction temperature for the NCL30125B2DR2G?
The maximum junction temperature is 150°C.
- How does the fault detection work in the NCL30125B2DR2G?
The controller features a timer-based fault detection that triggers a latch when the fault thresholds are exceeded.
- What is the storage temperature range for the NCL30125B2DR2G?
The storage temperature range is from -60°C to 150°C.
