LTC3499 View Datasheet(PDF) - Linear Technology

Part Name

Description

MFG CO.

LTC3499

750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection

Linear Technology 

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LTC3499/LTC3499B

APPLICATIONS INFORMATION

There is a resultant gain increase with a phase lag which

makes it difficult to compensate the loop. At heavy loads

the right half plane zero can occur at a relatively low

frequency. The loop gain is typically rolled off before the

RHP zero frequency.

The typical error amp compensation is shown in Figure 3,

following the equations for the loop dynamics:

( ) fPOLE1~

1

2 • π • 10e6 • CC1

which is extremely close to DC.

( ) fZERO1=

1

2 • π • RZ • CC1

( ) fPOLE2 =

1

2 • π • RZ • CC2

VOUT

6

ERROR AMPLIFIER

1.22V

R1

FB

7

R2

VC

8

RZ

CC2

CC1

3499 F03

Figure 3: Typical Error Amplifier Compensation

3499fc

12

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