Overview
The NCP1034DR2G is a high voltage PWM controller designed by onsemi for high performance synchronous Buck DC/DC applications. This controller is capable of handling input voltages up to 100 V and drives a pair of external N-MOSFETs. It features a programmable switching frequency up to 500 kHz, allowing for flexibility in tuning the operation to meet system-level requirements. The NCP1034DR2G includes an external synchronization feature, precise output voltage regulation using a 1.25 V reference voltage, and various protection mechanisms such as under voltage lockout and hiccup current limit.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage | VCC | 8 | - | 75 | V |
| Switching Frequency | fSW | 25 kHz | - | 500 kHz | kHz |
| Output Drive Capability | - | - | - | 2 A | A |
| Feedback Voltage | VFB | 1.25 V | - | - | V |
| Undervoltage Lockout (Rising) | UVLO (Rising) | 1.19 V | 1.25 V | 1.31 V | V |
| Undervoltage Lockout (Falling) | UVLO (Falling) | 1.10 V | 1.15 V | 1.20 V | V |
| SYNC Frequency Range | SYNC(FS) | - | - | 500 kHz | kHz |
Key Features
- High voltage operation up to 100 V
- Programmable switching frequency up to 500 kHz
- 2 A output drive capability
- Precision reference voltage (1.25 V)
- External frequency synchronization
- Programmable soft-start with prebiased load capability
- User-programmable undervoltage lockout and hiccup current limit
- Separate power ground for MOSFET drivers
Applications
- 48 V Non-Isolated DC-DC Converter
- Distributed Point of Load Power Architectures
- General High Voltage DC-DC Converters
- Embedded Telecom Systems
- Networking and Computing Voltage Regulator
Q & A
- What is the maximum input voltage for the NCP1034DR2G?
The maximum input voltage for the NCP1034DR2G is up to 100 V.
- What is the range of programmable switching frequency for the NCP1034DR2G?
The switching frequency is programmable from 25 kHz up to 500 kHz.
- What is the output drive capability of the NCP1034DR2G?
The output drive capability is 2 A.
- How is the output voltage regulated in the NCP1034DR2G?
The output voltage is precisely regulated using the internally trimmed 1.25 V reference voltage.
- What protection features are included in the NCP1034DR2G?
The NCP1034DR2G includes protections such as under voltage lockout and hiccup current limit.
- Can the switching frequency of the NCP1034DR2G be synchronized with an external clock?
- How can the soft-start function be programmed in the NCP1034DR2G?
The soft-start function can be programmed using an external capacitor connected to the SS/SD pin.
- How is the undervoltage lockout threshold set in the NCP1034DR2G?
The undervoltage lockout threshold can be set using an external resistor divider connected to the UVLO pins.
- What is the purpose of the PGND pin in the NCP1034DR2G?
The PGND pin serves as a separate ground for the MOSFET driver and should be connected to the system’s power ground plane.
- How can the output voltage be disabled in the NCP1034DR2G?
The output voltage can be disabled by pulling the SS/SD pin below 0.3 V.
