LT8210 datasheet(40/59 Pages) AD

Part #	LT8210

Description	100V VIN and VOUT Synchronous 4-Switch Multiphase Buck-Boost DC/DC Controller

PDF	59 Pages

Scroll/Zoom	100%

Manufacturer	AD [Analog Devices]

Direct Link	http://www.analog.com

Logo

40 / 59 page

Data Sheet

LT8210-1

analog.com

Rev. A

40 of 59

Figure 63. Transition from RT Set Frequency to Synchronization

Figure 64. Transition from Synchronization to RT Set Frequency

Spread-Spectrum Frequency Modulation

Switching regulators can be particularly troublesome for applications where electromagnetic interference (EMI) is a

concern. To improve EMI performance, the LT8210-1 includes a user-selectable triangular frequency modulation

scheme. When the SYNC/SPRD pin is tied to the VDD spread spectrum, functionality is enabled. The LT8210-1 will

slowly spread fSW between the nominal RT set frequency to 112.5% of that value. Figure 65 and Figure 66 demonstrate

the difference in the noise spectrum and switching waveforms with the spread spectrum feature enabled.

10µs/DIV

SYNC

1V/DIV

SW1

20V/DIV

SW2

20V/DIV

2A/DIV

10µs/DIV

SYNC

1V/DIV

SW1

20V/DIV

SW2

20V/DIV

2A/DIV

LT8210 Datasheet(PDF) 40 Page - Analog Devices