Overview
The ADP1074ARWZ-RL, produced by Analog Devices Inc., is a current mode, fixed frequency, active clamp, synchronous forward controller designed for isolated DC to DC power supplies. This controller integrates Analog Devices' proprietary iCouplers, which eliminate the need for bulky signal transformers and optocouplers, thereby reducing system design complexity, cost, and component count while improving overall system reliability.
The ADP1074 offers a compact system-level design and achieves higher efficiency compared to nonsynchronous forward converters, especially at heavy loads. It includes MOSFET drivers on both the primary and secondary sides, along with features such as input current protection, undervoltage lockout (UVLO), precision enable with adjustable hysteresis, overtemperature protection (OTP), and a power-saving light load mode (LLM).
Key Specifications
| Parameter | Symbol | Test Conditions/Comments | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | VIN | 4.7 µF capacitor from VIN to PGND1, 1 µF capacitor from VREG1 to PGND1 | 4.7 | 24 | 60 | V |
| Quiescent Supply Current | IVIN | VIN > VIN UVLO, NGATE and PGATE unloaded at 100 kHz | 5.3 mA | mA | ||
| VREG1 Voltage Clamp | VREG1 | IVREG1 = 3 mA, VEN < 1.2 V | 13.5 | 14.3 | 15.2 | V |
| NGATE and PGATE High Voltage | IVREG1 = 20 mA, VIN > 9 V | 7.8 | 8 | 8.2 | V | |
| CS Limit Threshold | VCS_LIM | Over current sense limit threshold | 120 mV | mV | ||
| Current Source di/dt for Slope Compensation | Switching period (tS) = 1/fS | 20 μA per tS | μA per tS |
Key Features
- Current mode controller for active clamp forward topology
- Integrated 5 kV (wide body SOIC package) or 3.0 kV (LGA package) rated dielectric isolation voltage with Analog Devices' proprietary iCouplers
- MOSFET drivers on both the primary and secondary sides
- Input current protection, undervoltage lockout (UVLO), precision enable with adjustable hysteresis, overtemperature protection (OTP), and power-saving light load mode (LLM)
- Differential output voltage sensing, overvoltage protection, power good, tracking, and programmable light load mode setting
- External frequency synchronization, programmable maximum duty cycle, and slope compensation
- Integrated 8 V LDO on the primary side and 5 V LDO on the secondary side
Applications
The ADP1074ARWZ-RL is suitable for a variety of isolated DC to DC power supply applications, including:
- High-reliability industrial power supplies
- Medical devices requiring high isolation and efficiency
- Telecommunication and data communication equipment
- Aerospace and defense systems where high efficiency and reliability are critical
- Server and storage power supplies in data centers
Q & A
- What is the primary function of the ADP1074ARWZ-RL?
The ADP1074ARWZ-RL is a current mode, fixed frequency, active clamp, synchronous forward controller designed for isolated DC to DC power supplies.
- What is the role of Analog Devices' proprietary iCouplers in the ADP1074ARWZ-RL?
The iCouplers eliminate the need for bulky signal transformers and optocouplers, reducing system design complexity, cost, and component count while improving overall system reliability.
- What are the key protection features of the ADP1074ARWZ-RL?
The controller includes input current protection, undervoltage lockout (UVLO), overtemperature protection (OTP), and power-saving light load mode (LLM).
- What is the typical operating voltage range for the ADP1074ARWZ-RL?
The supply voltage range is from 4.7 V to 60 V.
- How does the ADP1074ARWZ-RL achieve high efficiency?
It achieves higher efficiency compared to nonsynchronous forward converters, especially at heavy loads, by integrating MOSFET drivers on both the primary and secondary sides.
- What are the package options available for the ADP1074ARWZ-RL?
The controller is available in a 24-pin SOIC package.
- What is the significance of the VREG1 voltage clamp in the ADP1074ARWZ-RL?
The VREG1 voltage clamp ensures stable voltage regulation on the primary side, with a typical voltage of 14.3 V.
- How does the ADP1074ARWZ-RL handle overcurrent protection?
The controller includes an overcurrent sense limit threshold and a hiccup mode to manage overcurrent conditions.
- What is the purpose of the slope compensation feature in the ADP1074ARWZ-RL?
Slope compensation helps in preventing subharmonic oscillations in the current mode control loop.
- Can the ADP1074ARWZ-RL be synchronized with an external clock?
Yes, the controller supports external frequency synchronization.
