HT8691 integrates a boost converter with a filter-less stereo class D audio power amplifier to provide 5.5W continuous power into a into a 4Ω speaker when operating from a Li-battery voltage boosted to 6.5V. Meanwhile, the boost output voltage is adjustable.

Function: 5.5W Anti-Clipping Mono Class D Audio Amplifier with Boost Converter

Package: SOP8L-PP Pin type

Manufacturer: Jiaxing Heroic Technology

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Description

HT8691 features Anti-Clipping Function (ACF) which detects output signal clip due to the over input signal and suppresses the output signal clip automatically. Also, the ACF function can adapt the output clip caused by power supply voltage down with battery. It can significantly improve the sound quality, creating a very comfortable musical enjoyment, and to protect the speakers from overload damage. It also supplies ACF OFF mode.

Features

・Anti-Clipping Function (ACF)

・Filter-less Modulation, Eliminating Output Filter

・Output Power

(1) 5.5W (VBAT=4.2V, PVDD = 6.5V, RL=4Ω, THD+N=10%)

(2) 3.0W (VBAT=4.2V, PVDD = 6.5V, RL=8Ω, THD+N=10%)

・Power Supply

(1) Boost Input VBAT：2.5V to 5.5V

(2) Boost Output PVDD：VBAT to 7.0V

・Adjustable BOOST Output Voltage

・Class AB / Class D

・Over Current Protection, Thermal Protection, Low volta

 

Pinout

 

Applications

1. Bluetooth Speakers, Portable Speakers

2. 2.1 Channel Speakers, Megaphone

3. iphone/ipod/ipod docking, MP4/GPS

4. Tablet PC/Note Book, Smart Phones

5. LCD TV/Monitor, Portable Gamers

 

 

HT8691 Datasheet

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BD9423EFV is a high efficiency driver for white LEDs and designed for large LCD panel. This IC is built-in high current drive and high responsibility type 6ch LED drivers and 1ch boost DCDC converter. BD9423EFV has some protect function against fault conditions, such as the over-voltage protection (OVP), LED OPEN and SHORT protection, the over current limit protection of DCDC (OCP).

Part Number: BD9423

Function: 6ch boost LED driver which constant setting can be shared by I2C control

Package: HTSSOP-B40 Pin type

Manufacturer: Rohm

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Description

The BD9423EFV is a 6-channel boost LED driver integrated circuit from Rohm Semiconductor, featuring a wide operating voltage range from 9.0V to 35.0V, a 200kHz oscillator frequency (with a 100kOhm resistor), and a typical operating current of 9mA; primarily designed for applications like LCD backlighting in TVs, computers, and notebooks, with key features including high current drive capability per channel, constant current accuracy, and various protection mechanisms against over-voltage, open LED detection, and short circuit conditions.

 

Features

1. Operating power supply voltage range:9.0V to 35.0V

2. Oscillator frequency: 200kHz (RT=100kΩ)

3. Operating Current: 9mA (typ.)

 

Pinout

 

Key Specifications

1. LED drivers Max curret 400mA per channel

2. Constant current accuracy ±1.8% (IC only)

3. Current analog (linear) dimming by ADIM pin

4. SHORT detection voltage is set by LSP pin

5. Error detection output by FAIL pin

6. Master/Slave mode inside

 

 

Applications

1. TV, Computer Display

2. Notebook, LCD Backlighting

 

 

BD9423EFV Datasheet

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