HV9961LG-G IC

Technical Specifications of HV9961LG-G

Datasheet	HV9961LG-G datasheet
Category	Integrated Circuits (ICs)
Family	PMIC – LED Drivers
Manufacturer	Microchip Technology
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Type	DC DC Controller
Topology	Step-Down (Buck)
Internal Switch(s)	No
Number of Outputs	1
Voltage – Supply (Min)	8V
Voltage – Supply (Max)	450V
Voltage – Output	–
Current – Output / Channel	–
Frequency	–
Dimming	Analog, PWM
Applications	Backlight, Lighting, Signage
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package	8-SOIC

HV9961LG-G Introduction

Here’s the answer to your LED driver’s accuracy and regulation issues: the HV9961 integrated circuit. This IC provides quick average current regulation with zero peak-to-average error by operating in a continuous Off-time mode. The HV9961 boasts greatly enhanced line and load constraints, allowing for a phenomenal output LED current accuracy of 3%. In addition, a current limit comparator is included in this IC to prevent damage from a short circuit in hiccup mode. The HV9961’s linear and pulse-width-modulation (PWM) dimming inputs provide unrivaled control. The HV9961 can be used as a drop-in replacement for the HV9910B in many different settings to enhance the precision and management of LED current.

HV9961LG-G General Description

The HV9961 is a constant-Off-time-mode, constant-current-control LED driver IC. There is no peak-to-average inaccuracy with this control IC, unlike the HV9910B. The LED current may be precisely regulated for both line and load without the requirement for loop compensation or high-side current sensing.

The LED current it produces is accurate to within 3%. The IC features a current limit comparator to prevent damage in the event of a short circuit at the Hiccup mode output. A supply voltage of 8V-450V powers the HV9961. An external control signal that is TTL-compatible can be plugged into the PWM dimming input. An internal 275 mV reference and an external 0V-1.5V linear dimming input allow precise output current regulation. To enhance LED current accuracy and regulation, the HV9961 can be utilized as a drop-in replacement in many applications thanks to its pin-to-pin compatibility with the HV9910B.

HV9961LG-G Features

• Rapid Regulation of Average Current.
• Controllable, Permanently Off Switching Timer.
• Input for Linear Dimming.
• Input for Pulse Width Modulated Dimming.
• Output Protection against short circuits and a skip mode that works at temperatures between -40 and +125 degrees Celsius.

HV9961LG-G Applications

• LED Driver Use in DC/DC or AC/DC Systems.
• An LCD screen’s LED backlight driver.
• Constant-current power supply for general use.
• LEDs for advertising and screens.
• Using LEDs to illuminate buildings and provide aesthetic appeal.
• LEDs for the streetlights.

Application Information

The output current of a buck converter can be easily and cheaply controlled by using peak current control (as implemented in the HV9910B). Nevertheless, the current ripple in the output inductor and the propagation delay in the current sense comparator cause accuracy and regulation issues. While the low-side switch buck converter’s control switch is at ground potential, the complete inductor current signal is cut off from direct switch current sensing via the sense resistor at the ground path. While monitoring the maximum current through the switch is straightforward, the average current through the inductor is often managed by level translating the sensing signal from +VIN.

However, in offline AC or other high-voltage DC applications, this type of average-current regulation may become too complex and expensive to be feasible. The HV9961 uses a custom control technique that enables rapid and precise regulation of the buck inductor’s average current by directly sensing the switch current. Current control loop compensation is unnecessary. The current through the LEDs at the output responds to PWMD input in much the same way as the HV9910B.

An increase or decrease in the amplitude of the ripple current in the inductor does not influence this control technique. The current through an LED remains constant regardless of changes in inductance, switching frequency, or output voltage. Stability and improved LED current regulation across a broad input voltage range are achieved by the use of constant off-time management of the buck converter. The HV9961 lacks support for Constant Frequency mode, unlike the HV9910B.

● Off Timer

How long the gate driver is turned off is set by the timing resistor linked to RT and GND. In contrast to the HV9910B, the practice of connecting this resistor between the RT and Gate no longer works.

● Average-Current Control Feedback and Output Short-circuit Protection

Constant-current feedback is provided by averaging the current through the switching Metal-oxide Semiconductor Field-effect Transistor (MOSFET). One can use a sensing resistor connected to the CS pin to measure this current. The feedback works in an Open-loop mode, which allows for quick operation. There is no need to offer any sort of payment.

● Input Voltage Regulator

The HV9961’s VIN input accepts inputs between 8 VDC and 450 VDC for power. The HV9961 has a fixed VDD voltage of 7.5V when this voltage is connected to its VIN pin. The IC and any linked external circuitry can be powered by this voltage as long as the current drawn does not exceed the maximum rated current or the thermal ratings of the package are not exceeded. A low equivalent series resistance (ESR) capacitor must be connected across the VDD pin to create a low-impedance path for the high-frequency current of the gate output. Moreover, a voltage greater than the HV9961’s internally regulated 7.5V and less than 12V can be supplied directly through the VDD pin. The constant voltage at VIN is limited by power dissipation in the package, even though the instantaneous voltage rating is 450V.

To prevent the HV9961 from being damaged by excessive power dissipation, a resistor or Zener diode can be connected in series with the VIN input. The 100V Zener diode in the previous example would allow the circuit to withstand 490V.

● Gate Output

The HV9961’s gate output controls an external MOSFET. For switching frequencies under 100 kHz, a QG of less than 25 nC is recommended for the external MOSFET, while a QG of less than 15 nC is recommended for switching frequencies above 100 kHz.

PWM Dimming

PWM dimming performance is essentially identical to that of the HV9910B thanks to the HV9961’s quick open-loop responsiveness of the average-current control loop.

● Linear Dimming

When the LD voltage drops below 1.5V, the constant-current feedback’s intrinsic 275 mV reference is replaced with VLD x 0.185. For so long as the inductor’s current is uninterrupted. However, the gate output is turned off when VLD is less than 150 mV. If VLD exceeds 200 mV, the gate signal will begin to recover. Sometimes, the lamp’s off switch must be connected to the same input as the brightness control signal.

Conclusion

Thus, the HV9961 is a loop compensation and high-side current sensing-free LED driver IC, providing superior LED current accuracy and regulation. It is a great option for increasing LED current accuracy and regulation in a wide variety of LED applications, including LED signage and displays, architectural and decorative LED lighting, LED street lighting, and LED backlight driver for LCD displays, thanks to its current limit comparator for Hiccup mode output short-circuit protection and compatibility with HV9910B. Furthermore, it may be used as a drop-in replacement for existing LEDs and is compatible with various power supply voltages, pulse width modulation (PWM) inputs, and linear dimming inputs. Partner with ICRFQ for top-quality products and exceptional customer service, and invest in the HV9961 to take your project to new heights.

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