Datasheet > AN04-005

AN04-005

更新时间： 2024-10-28 06:37:11

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LINEAGEPOWER		/
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Margining and Voltage Programming

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AN04-005 数据手册

Application Note

2 September 2008

PDF: margin-volt_prog_an.pdf

Application Guidelines for Non-Isolated Converters

AN04-005: Margining and Voltage Programming

output voltage is scaled down by a divider consisting of

resistors R1 and R2. The mid point of the divider is

connected to the inverting input of the op-amp which is

used to process the error voltage between the internal

Introduction

The Austin Lynx^TM, Lynx II, TLynx and Naos Raptor

series of non-isolated modules all have the ability to

adjust their output voltage by interfacing through the Trim

pin. In addition to the output voltage set function, two

other types of output voltage adjustment are frequently

used. The first is margining, where the output voltage is

adjusted a fixed percentage (typically ±5 or 10%) off the

nominal during system level test. This adjustment is

generally used for checking the operational margin of

circuits and thereby assuring the robustness of the

application. The second is voltage programming where

an external voltage is provided to either provide more

accurate adjustment of the output voltage of the module

reference voltage Vref (0.7V) and the divider midpoint

voltage. The voltage control loop of the module regulates

the output voltage so as to maintain the voltage at the

mid point of the divider equal to the reference voltage.

The trim pin is connected through a 1KΩ resistor to the

mid point of the divider. By connecting an external

resistor between the Trim pin and GND, the divider ratio

is changed thus allowing adjustment of the output

voltage. In both margining and voltage programming, the

output voltage is adjusted by in essence effecting a

change in the scaling between the output and voltage

divider mid point voltages.

In the TLynx and Naos Raptor series of modules, a

simpler circuit is used to divide down the voltage as

shown in Fig. 2. However, the same functionality is

obtained is obtained through the TRIM pin.

or to implement

margining-like function. This

application note describes circuits and provides design

guidelines for implementing margining or voltage

programming.

To understand how margining or voltage programming

are done, it is beneficial to understand the circuit used to

scale down the output voltage in the Austin Lynx and

Lynx II series of modules. Figure 1 shows a portion of the

output voltage divider and feedback circuitry that is used

in all Lynx and Lynx II series modules (except the fixed-

output voltage 5/3.3V and 12V input Lynx modules –

these come in different output voltage versions and do

not have an wide-output voltage adjust capability). The

TLynx or

Naos Raptor Module

Vout

PWM

Controller

AMP

Trim

GND

Austin Lynx or

Lynx II Series Module

Vout

VREF

PWM

Controller

VREF

0.6V

0.591V

0.6V

3.3Vin TLynx

12Vin TLynx

3A/6A/10A/20A Naos Raptor

40A/50A/60A Naos Raptor

10K

AMP

Trim

GND

VREF

Fig. 2. Circuit diagram of the output voltage divider

and feedback circuitry used in the TLynx and Naos

Raptor series of modules.

VREF

0.7V

5Vin Austin Lynx or

Implementing Margining

30.1K 402K

Lynx II

12Vin Austin Lynx

or Lynx II

Austin MegaLynx

15K

200K

Open

0.7V

0.8V

Margining is implemented by essentially changing the

divider by small amounts to obtain the desired margining

voltages. One method to accomplish this is shown in Fig.

3. This scheme connects a pre-determined resistor with a

small FET in series between the trim pin and ground (to

margin up or slightly increase the output voltage), and a

similar FET+resistor combination in series between TRIM

1.5K

100

Fig. 1. Circuit diagram of the output voltage divider

and feedback circuitry used in the Austin Lynx and

Lynx II series of modules (except fixed-output 5/3.3V

in Austin Lynx and 12V in Austin Lynx modules).

LINEAGE POWER

12 3 4

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AN0420NA	MICROCHIP	获取价格	TRANSISTOR,MOSFET,ARRAY,N-CHANNEL,200V V(BR)DSS,30MA I(D),DIP
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AN0430NA	MICROCHIP	获取价格	TRANSISTOR,MOSFET,ARRAY,N-CHANNEL,300V V(BR)DSS,30MA I(D),DIP
AN0430ND	MICROCHIP	获取价格	TRANSISTOR,MOSFET,ARRAY,N-CHANNEL,300V V(BR)DSS,25MA I(D),CHIP / DIE
AN0432NA	MICROCHIP	获取价格	TRANSISTOR,MOSFET,ARRAY,N-CHANNEL,320V V(BR)DSS,30MA I(D),DIP
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