AVR 171 (serv.man3) - Harman Kardon Audio Service Manual (repair manual). Page 100

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

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 mΩ, 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

AVR 171 Service Manual

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