AVR 161S (serv.man4) - Harman Kardon Audio Service Manual (repair manual). Page 97

The DB1230 is a high frequency synchronous 
rectified step-down regulator which integrates an 
110m

Ω high-side power MOSFET and an 85mΩ 

low-side power MOSFET.   

It provides easy & compact solution to implement 
3A continuous output current over a wide range 
input from 4.5V to 16V with a good load and line 
regulation. 

The current-mode control operation provides a 
good loop-stability under any system condition 
and fast transient response. 

According to an internal compensation and a high 
frequency operation, the DB1230 requires a few 
number of external components mentioned in the 
basic dc-dc power system. 

The built-in protections are allowed to have a 
simple design and a robust operation. 

For a good thermal performance, the DB1230 
uses an internal temperature independent voltage 
reference and the package that has low ɂ

JA

 

(<50°C/W) 

It is available in 8-pin SOP-EP or 14-pin TSSOP 
package with an exposed pad. 

„

 4.5V to 16V operating input range.

„

High-side 110 m

Ω, low-side 85 mΩ

Built-in power MOSFETs.

„

Fixed PWM 700kHz switching frequency.

„

Output voltage accuracy :  • 2%

„

3A continuous output current.

„

Low reference voltage : 0.8V

„

Programmable soft-start.

„

Internal Compensation.

„

Built-in SCP, OCP, TSD Protection.

„

Thermally Enhanced 8-SOP-EP Package

„

 Digital Set Top Boxes.

„

Personal Video Recorder.

„

Flat Panel TV & Monitor.

„

Distributed Power Systems.

DB1230HETR

8-SOP-EP

DB1230HPTR

14-TSSOP-EP

Fig.1 Normal application circuit      

   Fig.2 Efficiency (Vout=3.3V) 

Harman Kardon

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