Driver

BIT3267 Datasheet PDF – High Performance PWM Controller

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Part Number: BIT3267

Function: High Performance PWM Controller

Package: SOP-8 Type

Manufacturer: BiTEK ( http://www.bitek.com.tw )

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BIT3267 datasheet

Description

The BIT3267 is a high frequency PWM controller integrating required functions for boost conversion in a small SOP-8 package. A low 0.21V feedback voltage, over voltage protection and over current protection and load short protection make BIT3267 an ideal controller for LED backlight supplies. Frequency selection is flexible in variable system design. Internal soft start function can avoid inrush current during startup period. Over temperature protection and UVLO make system reliable. CMOS  process greatly reduces the perating current compared with similar products.

 

Features

1. Current Mode PWM Controller
2. 8V ~ 28V operation voltage
3. Local dimming function
4. Internal minimum off time
5. Over current protection, OCP
6. Over voltage protection, OVP
7. Load short protection, LSP
8. Frequency selection
9. Internal Soft-Start
10. Over temperature protection, OTP
11. Internal Under Voltage Lock Out, UVLO
12. Totem Pole Output

Applications

1. Backlight for LED Panels
2. Portable Device Backlighting
3. LCD Display Module

Functional description:

Under voltage locked out, UVLO :

The Under-voltage lockout turns-off BIT3267 if the input voltage drops below the under-voltage lockout threshold. It turns-on BIT3267 if the input voltage is higher than its threshold. The hysteresis voltage is about 1V.

LED current regulation :

Please refer following figure, a resistor RS is connected serial with LED string that can sense LED current. This sensed LED current signal feeds to INN pin and compares with its internal reference voltage of the error amplifier. The error amplifier outputs an error signal to control LED current.

Pinouts:
BIT3267 pinout

1 OUT Output pin
2 GND Ground pin
3 OCP Over current protection and frequency selection
4 OVP Over voltage protection
5 INN The inverting input of the error amplifier
6 CMP Output of the error amplifier
7 EA Enable pin
8 VDD Power supply

 

BIT3267 Datasheet PDF Download


 

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AD8138 Datasheet – Differential ADC Driver ( PDF )

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Part Number: AD8138

Function: Low Distortion Differential ADC Driver

Package: 8-Lead SOIC and MSOP Type

Manufacturer: Analog Devices

Pinouts:

AD8138 datasheet

 

Description

The AD8138 is a major advancement over op amps for differential signal processing. The IC can be used as a single-ended-to-differential amplifier or as a differential-to-differential amplifier.

The device eliminates the need for a transformer with high performance ADCs, preserving the low frequency and dc infor-mation. The common-mode level of the differential output is adjustable by a voltage on the VOCM pin, easily level-shifting the input signals for driving single-supply ADCs.

Features

1. Easy to use, single-ended-to-differential conversion

2. Adjustable output common-mode voltage

3. Externally adjustable gain

4. Fast settling to 0.01% of 16 ns

5. Slew rate 1150 V/μs

6. Fast overdrive recovery of 4 ns

7. Low input voltage noise of 5 nV/√Hz

8. 1 mV typical offset voltage

Applications:

1. ADC drivers
2. Single-ended-to-differential converters
3. IF and baseband gain blocks
4. Differential buffers
5. Line drivers

Other data sheets are available within the file: AD8138AR, AD8138AR-REEL, AD8138AR-REEL7, AD8138ARM

AD8138 Datasheet PDF Download


AD8138 pdf