LT3752 datasheet(20/48 Pages) LINER

20 / 48 page

LT8311

8311f

For more information www.linear.com/LT8311

Figure 7. In SYNC Mode, the Primary Side IC Sends SOUT Signals Through a Pulse Transformer to the LT8311’s SYNC Pin.

SYNC < 1.2V Turns on MFG and Turns Off MCG. SYNC > 1.2V Turns On MCG and Turns Off MFG

1.2V

–1.2V

PRIMARY-SIDE IC

CONTROLS TIMING

OF OUT AND

SOUT SIGNALS

LT8311 CONTROLS FG AND CG

TIMING BASED ON SYNC INPUT

SIGNAL IN SYNC MODE

8311 F07

OUT

SOUT

SYNC

TIME

RESET

PRIMARY IC

SOUT

OUT

VIN

VOUT

COUT

•

LT8311

CSP

CSN

LOUT

SYNC

•

IMCG

RSYNC

CSYNC

TURN-ON

EDGE

TURN-ON

EDGE

MFG

TURN-ON

EDGE

MFG

TURN-ON

EDGE

MCG

TURN-ON

EDGE

MCG

TURN-ON

EDGE

MCG

MFG

SYNC Mode Shutdown

In SYNC mode, the LT8311 will shut off both secondary-

side MOSFETs, MCG and MFG, if any of the following

conditions are true:

1. VIN is less than its UVLO voltage

2. INTVCC outside its UVLO/OVLO limits

3. The TIMER pin has timed out (see the Applications

Information section for details on programming the

TIMER pin resistor).

4. The CSP and CSN pins have tripped the LT8311’s in-

ternal current comparator during MCG’s on-time. The

current in MCG, IMCG, is sensed after a 400ns blank

time has expired. This blank time starts at the turn-on

edge of MCG. See the Applications Information section

for details on configuring the CSP and CSN pins in

SYNC mode.

OPERATION

LT3752 Datasheet(PDF) 20 Page - Linear Technology

LT3752 Datasheet(HTML) 20 Page - Linear Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

Datasheet Download

Link URL