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LTC3766 数据表(PDF) 34 Page - Linear Technology

部件名 LTC3766
功能描述  Synchronous Rectifier Controller with Opto-Coupler Driver for Forward Converters
Download  48 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC3766 数据表(HTML) 34 Page - Linear Technology

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LT8311
34
8311f
For more information www.linear.com/LT8311
APPLICATIONS INFORMATION
Setting RTIMER in Preactive Mode
In preactive mode, the TIMER pin resistor, RTIMER, pro-
grams the maximum period that can elapse between two
CSW rising edges before a timeout period is triggered.
Timeout allows the LT8311 to stop all synchronous activ-
ity in the event that the primary-side IC stops switching.
Since CSW rising edges represent primary-side switching
activity, timeout of CSW rising edges is interpreted as
stoppage of switching—at which point the LT8311 ceases
all secondary-side synchronous switching, and starts its
evaluation period. Refer to the Operation section for de-
tails on the evaluation period. Secondary-side switching
resumes when all conditions within the evaluation period
are satisfied. Timeout also ensures that switching activity
within preactive mode occurs at a frequency that is within
preactive mode’s operating frequency range.
As shown in Figure 18, every time the CSW pin voltage
is detected to rise past 1.2V from a voltage level below
–150mV, the LT8311 resets its internal timeout signal.
The gate of the catch MOSFET, CG turns on (after some
propagation delay) when CSW is detected to fall below
–150mV. Upon CG going high, the catch MOSFET turns
on and pulls its drain voltage (CSW) close to its source
voltage, which is tied to GND. CG turns off predictively
in CCM before an anticipated CSW rising edge. If a CSW
rising edge (rising from below –150mV to above 1.2V)
does not come along in time to reset the timeout signal,
the signal eventually charges up to voltage VREF_TIMEOUT
and triggers an internal timeout condition. Consequently,
the LT8311 shuts down all synchronous conduction and
startstheevaluationperiod.Theevaluationperiodendsonly
when the four conditions listed in the Operation section,
including the timely reset of the internal timeout signal,
aresatisfiedforthreeconsecutiveCSWrisingedges.Upon
completion of the evaluation period, the LT8311 restarts
synchronous control.
Figure 18. If Timeout Is Triggered in Preactive Mode, LT8311 Shuts Down All Synchronous Conduction and
Starts the Evaluation Period (Note: CSW's ringing waveform is caused by the inductor current getting to 0A.)
0V
8311 F18
LT8311 INTERNAL
TIMEOUT SIGNAL
CG PREDICTIVE
TURN-OFF
TIMEOUT RESETS ONLY WHEN
CSW RISES PAST 1.2V, PRECEDED BY
FALLING BELOW –150mV
TIMEOUT
CSW
(PREACTIVE MODE)
CG
TIME
–150mV
1.2V
CG TURNS ON WHEN CSW < –150mV
EVALUATION PERIOD
VREF_TIMEOUT


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