Overview
The ADP1074ACCZ-R7, produced by Analog Devices Inc., is a current mode, fixed frequency, active clamp, synchronous forward controller designed specifically 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 enhancing overall system reliability.
The ADP1074 offers a compact system-level design with integrated isolators and MOSFET drivers on both the primary and secondary sides, resulting in higher efficiency compared to nonsynchronous forward converters, especially at heavy loads.
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 | ||
| Quiescent Supply Current | IVIN | VIN > VIN UVLO, NGATE and PGATE unloaded at 300 kHz | 5.8 | mA | ||
| Quiescent Supply Current | IVIN | VIN > VIN UVLO, NGATE and PGATE unloaded at 600 kHz | 6.8 | mA | ||
| CS Limit Threshold | VCS_LIM | Over current sense limit threshold | 120 | mV | ||
| CS Leading Edge Blanking Time | 150 | ns | ||||
| Dielectric Isolation Voltage | Wide body SOIC package | 5000 | V rms for 1 minute per UL 1577 | |||
| Dielectric Isolation Voltage | LGA package | 3000 | V rms for 1 minute per UL 1577 |
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' iCouplers
- Precision enable UVLO with adjustable hysteresis
- PGOOD pin for system flagging
- Tracking function from secondary side
- Remote (secondary side) shutdown/reset function
- Safety and regulatory approvals (UL recognition, CSA component acceptance notice, VDE certificate of conformity, etc.)
- Input current protection, undervoltage lockout (UVLO), overtemperature protection (OTP), and power saving light load mode (LLM)
- Integrated MOSFET drivers on both primary and secondary sides
- AEC-Q100 Qualified for Automotive Applications
Applications
The ADP1074ACCZ-R7 is designed for use in isolated DC to DC power supplies, particularly in applications requiring high efficiency and reliability. It is suitable for various industries, including:
- Automotive systems (AEC-Q100 qualified)
- Industrial power supplies
- Medical devices requiring isolated power supplies
- Telecommunication equipment
- High-reliability power systems where isolation is critical
Q & A
- What is the primary function of the ADP1074ACCZ-R7?
The ADP1074ACCZ-R7 is a current mode, fixed frequency, active clamp, synchronous forward controller designed for isolated DC to DC power supplies.
- What is the significance of the integrated iCouplers in the ADP1074?
The integrated 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 safety and regulatory approvals for the ADP1074?
The ADP1074 has UL recognition, CSA component acceptance notice, VDE certificate of conformity, and other regulatory approvals.
- What is the maximum dielectric isolation voltage for the wide body SOIC package?
The maximum dielectric isolation voltage for the wide body SOIC package is 5000 V rms for 1 minute per UL 1577.
- What is the maximum dielectric isolation voltage for the LGA package?
The maximum dielectric isolation voltage for the LGA package is 3000 V rms for 1 minute per UL 1577.
- Does the ADP1074 support remote shutdown/reset functions?
Yes, the ADP1074 supports remote (secondary side) shutdown/reset functions.
- What are the primary side functions of the ADP1074?
The primary side functions include programming the switching frequency, maximum duty cycle, external frequency synchronization, and slope compensation.
- What are the secondary side functions of the ADP1074?
The secondary side functions include differential output voltage sensing, overvoltage protection, power good, tracking, and programmable light load mode setting.
- Is the ADP1074 qualified for automotive applications?
Yes, the ADP1074 is AEC-Q100 qualified for automotive applications.
- What is the purpose of the PGOOD pin in the ADP1074?
The PGOOD pin is used for system flagging, indicating the power good status.
