HR1211

HR1211

Multi-Mode PFC and Current Mode LLC Controller With Programmable Audible Noise Reduction Control

Datasheet

Description

The HR1211 is a multi-mode PFC and current mode LLC combo controller that is configurable via UART interface. Power-saving technology helps achieve optimized efficiency across the full operating range.

The PFC controller employs a patented, digital average current control scheme to achieve hybrid CCM/DCM operation. Under heavy loads, CCM reduces the peak MOSFET current so the controller can be used across a wider load range. Under light loads, DCM reduces the switching frequency for better efficiency. Burst mode has configurable, digital soft switching to improve both light-load efficiency and audible noise.

Current mode control is implemented in the LLC stage to achieve good stability and fast response. Three operation modes are implemented based on the different load conditions: steady state, skip, and burst mode. This allows different load conditions to be independently optimized for efficiency. At light loads, digital, frequency-controlled burst mode is applied to reduce both switching power loss and audible noise. Adaptive dead-time adjustment (ADTA) and capacitive mode protection (CMP) is also applied to guarantee zero-voltage switching (ZVS) without capacitive mode operation.

The HR1211 has an internal, high-voltage current source for start-up, meaning that a traditional start-up resistor or external circuit is not required. The high-voltage (HV) current source can be implemented as an X-capacitor discharger when the AC input is in dropout, so a capacitor resistor is not required.

Protections include thermal shutdown (TSD), PFC open-loop protection (OLP), over-voltage protection (OVP), over-current limit (OCL) and LLC over-current protection (OCP), SO pin protection, and over-power protection (OPP).

The HR1211 is available in SOIC-20 and TSSOP-20 packages.

Advantages Include:

CCM/DCM multi-mode PFC control with high efficiency (light-load efficiency ƞ > 80%)
<100mW no-load power loss
High power factor due to capacitor current compensation (>0.95 at 20% loads)
UART interface and GUI to configure parameters

Features & Benefits

Operates at Frequencies Up to 500kHz in Steady State
Smart X-Capacitor Discharges during AC Dropout, Approved by IEC62368 and IEC60950
Built-In, High-Voltage Start-Up and X-Capacitor Discharger
Digital Control for Both PFC and LLC
Current Mode Control for LLC
Improved Skip Mode Control for LLC for Low Audible Noise
Adaptive Dead Time Adjustment (ADTA) for LLC
Capacitive Mode Protection for LLC
Configurable Soft Start
Comprehensive Protections: Brown-In/Brownout, Over-Voltage Protection (OVP), Over-Current Protection (OCP), Open-Loop Protection (OLP)

Active Part Numbers:

HR1211GM-xxxx-P HR1211GM-xxxx-Z HR1211GY-xxxx-P HR1211GY-xxxx-Z

Meaning of P & Z

Related Products

EVHR1211-Y-00B 600W, Offline Battery Charger PFC + LLC with the HR1211 Evaluation Board

The EVHR1211-Y-00B is an evaluation board designed for lithium-ion batteries, which are typically used in e-mobility applications and uninterruptible power supply (UPS) applications. This device can also be used as a general power supply unit.

If there is not a battery present, then the EVHR1211-Y-00B regulates the output voltage (V_OUT) to 58.8V. This solution is based on the HR1211, a PFC + LLC combination controller from a single integrated circuit.