LTM4641
TYPICAL APPLICATIONS
R1
20k
When V Exceeds ~36V, D1 Ensures MSP Is Operated
IN
4.5V START-UP
RT1
NTC
in Its Linear Region and Provides Rudimentary Surge
Ride-Through Protection for LTM4641.
OPERATION UP TO 28V
IN
CONTINUOUS, TRANSIENT
PROTECTED TO 80V
IN
Optional: RT1, R1, R2, R3.To Enable RT1’s Detection of
Thermal Overstress in MSP During Sustained Input Voltage
MSP
+
C
IN(BULK)
C
Surge Events, Place RT1 in Extremely Close Proximity to
MSP in PCB Layout. Experimentally Determine the Vaules
of R1, R2 and R3 That Yield Desired Overtemperature
Shutdown Inception and Restart Recovery Thresholds
Consistent with MSP’s Rated Operating Junction
Temperature and Safe Operating Area
IN(MLCC)
100µF
100V
10µF
100V
×2
D1
36V
2%
R2
8.25k
R
fSET
1M
5V
V
V
V
SW
V
ING INGP
INH
OUT
1V
V
V
INL
OUT
100µF
6.3V
×4
10A
f
SET
MCB
CROWBAR
D2 Enables Detection
UVLO
of V UVLO Falling
IN
5V
R3
2.7M
LATCH
D2
R
+
SET1A
V
ORB
5.49k
HYST
FCB
+
V
OSNS
LOCAL HIGH
FREQUENCY
DECOUPLING
LTM4641
R
SET1B
5.49k
V
IN
OUT
LT®3010-5
LOAD
–
–
INTV
DRV
CC
V
OSNS
SHDN
SENSE
GND
CC
V
ORB
IOVRETRY
TEMP
1V
R
ROV
4.7M
REF
OVPGM
OTBH
PGOOD
OVLO
RUN
MSP and Switching Action Are Temporarily
Latched Off When a Module Overtemperature
or Output Overvoltage (OOV) Condition is
Detected--Additionally, the Crowbar MOSFET MCB
is Turned On to Protect the Load Upon OOV Detection.
Autonomous Restart Attempts Occur in 9 Second
Intervals When Conditions Return to Normal
R
BOV
Switching Action Is
Temporarily Latched Off if
29.4k
TRACK/SS
TMR
COMP SGND GND
V
Exceeds 80V; Autonomous
IN
Restart Attemps Occur in
C
C
TMR
1µF
SS
4641 F47
9 Second Intervals When Input
1nF
Voltage Returns Below 80V. Note
LT3010-5 is Rated for 80V, Absolute
Maximum. See Note 1.
D2: CENTRAL SEMI CMMSH1-100G
MCB: NXP PSMN5R0-30YL
MSP: NXP PSMN028-100YS
SGND CONNECTS TO GND INTERNAL TO MODULE. KEEP SGND
ROUTES/PLANES SEPARATE FROM GND ON MOTHERBOARD
RT1: MURATA NCP15WM474J03RC
Figure 47. LTM4641 Generating 1V Output at 10A, Surge Protected up to 80VIN Transients.
Start-Up and Shutdown Waveforms with TMR = INTVCC Shown In Figure 2
V
IN
20V/DIV
V
INH
20V/DIV
V
OUT
20mV/DIV
AC-COUPLED
/INTV /DRV /LATCH
V
INL
CC
CC
5V/DIV
4641 F48
2ms/DIV
Figure 48. Oscilloscope Snap-Shot of Figure 47 Circuit Riding Through
80VIN Transient While Delivering 1VOUT at 10A to the Load
4641f
49
Linear [ Linear ]
