DOWNLOAD Harman Kardon AVR 171S (serv.man4) Service Manual ↓ Size: 12.12 MB | Pages: 127 in PDF or view online for FREE

7 

5 

PG 

Open Drain Power-Good (PG) Output. 

8 6 EN 

Enable 

Input. 

1,2 

7,8 

VIN 

Input Supply Voltage Pin. 

3,4 1,2 OUT 

Output 

pin 

5 3 FB 

Feedback Pin. Connect to output through a voltage-divider to set 
the output. Recommended that the tolerance of feedback 
resistors is below 1%. 

6 4 

GND 

Ground 

Pin 

EP 

EP 

Exposed pad

Should be connected to GND for Heatsink. 

G

G

Harman Kardon

AVR 171 Service Manual

Page 97 of 174

 

The DB1510B low-dropout linear regulator 
operates from input voltages as low as 2.2V and 
are able to deliver up to 1A of continuous output 
currentGthe DB1510B offers low dropout (typically 
800mV at 1A) and low quiescent current (typically 
400uA at 0.1A). 

Fixed output voltages of the DB1510B are 1.0V, 
1.2V, 1.5V, 1.8V, 2.5V, 2.8V, 3.3V & 3.5V and the 
output voltage is 2% accurate over load and line 
variations. These regulators use small 2.2

μF 

MLCC input capacitor and 4.7

μF MLCC output 

capacitors to deliver 1A output current.   

Soft-start reduces inrush current. The other 
features include over current protection (OCP), 
short-circuit protection (SCP), and thermal shut 
down protection (TSD). 

The DB1510B is packaged SOT-223, TO-252 & 
8-pin thin dual flat no lead (TDFN) package that a 
heat sink or an exposed pad for optimal power 
dissipation. 

„  Input Voltage Range: 2.2V to 6.0V 
„  Quiescent Current: Typ. 400uA 
„  Current limit : Min. 1.2A 
„  Dropout Voltage: Typ. 800mV @ 1A 
„  Compatible with MLCC Capacitors 
„  Soft-Start Limits Inrush Current G
„  Thermal Shutdown Protection 
„  Over Current & Short Circuit Protection 

„ Servers 
„ Storage 
„ Networking 
„ Optical 

Modules 

„ Post 

Regulators 

„ Notebooks 
„ PDA 

DB1510BT3TRxx

 TO-252 

(I) 

DB1510BT32TRxx

 TO-252 

(II) 

DB1510BNNTRxx

 SOT-223 

(I) 

DB1510BNN2TRxx

 SOT-223 

(II) 

DB1510BDLTRxx

 8-TDFN 

(3x3) 

 

G

8-TDFN (3x3) Application Circuit G

G

Protection 

Protection 

odules 

odules 

egulators 

gulators 

books 

ooks 

DA 

A 

DB151

B1

DB

DB

Harman Kardon

AVR 171 Service Manual

Page 98 of 174

1 3 1 

VIN 

Input 

Voltage 

2, TAB 

1 

3 

GND 

Ground 

3 

2, TAB 

5, 6 

OUT 

Output Voltage 

- 

- 

2, 4, 7, 8 

NC 

No Connection 

G G G G G G

G G G G G

G

Harman Kardon

AVR 171 Service Manual

Page 99 of 174

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 

 

G

G

G

 

 

 

Fig.1 Normal application circuit                        Fig.2 Efficiency (Vout=3.3V) 

G

G

Harman Kardon

AVR 171 Service Manual

Page 100 of 174