RT9134PC datasheet(9/11 Pages) RICHTEK

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RT9134

Preliminary

DS9134-04

August 2007

www.richtek.com

Figure 2. Derating Curves for the RT9134 Package

Short Circuit Condition

An internal short-circuit protection circuit is implemented

to protect the device from output short circuit. The RT9134

limits the short circuit current to

±120mA if the output is

directly shorted to positive/negative supply rails. For

maximum reliability, the maximum continuous output

current more than

±35mA is not recommended.

Unused Amplifier

It is recommended to connect the unused amplifier as a

unit gain circuit. The negative input is directly connected

to the output and the positive input should be connected

to the ground.

LCD Panel Applications

The RT9134 is mainly designed for LCD gamma and

V-com buffer. OP Amplifier-C has 120mA instantaneous

source/sink peak current. To test the performance of the

RT9134 for LCD driving capability, the test circuit is to

simulate the V-com driver as shown Figure 3. Series

capacitors and resistors connected to the output of the

OP simulate the load of LCD panel. The 300

Ω and 3kΩ

feedback resistors are used to improve the settling time.

This circuit is the worst case for a V-com buffer. Figure 4

shows the waveforms of the output peak current capability.

Figure 3. V-com Test Circuit

Figure 4. Scope Photo of the V-com Peak Current

Time (2.5

μs/Div)

300k

IN 0V to 8V

Measure

Current

Square Wave

10nF

200

400

600

800

1000

1200

1400

1600

1800

2000

2200

2400

105 120 135 150

Ambient Temperature (°C)

4-Layers Board

VQFN-16L 4x4

TSSOP-14

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