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Linear Technology Electronic Components Datasheet

LTC3725EMSE Datasheet

Single-Switch Forward Controller and Gate Driver

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FEATURES
High Speed Gate Driver for Forward Converter
On-Chip Rectifier and Self-Starting Architecture
Eliminates Need for Separate Gate Drive Bias
Supply
Wide Input Voltage Supply Range: 9V and Up
Linear Regulator Controller for Fast Start-Up
Precision UVLO with Adjustable Hysteresis
Overcurrent Protection
Volt-Second Limit Prevents Transformer Core
Saturation
Voltage Feedforward for Fast Transient Response
Available in 10-Lead MSOP Package
U
APPLICATIO S
Isolated 48V Telecommunication Systems
Internet Servers and Routers
Distributed Power Step-Down Converters
Automotive and Heavy Equipment
LTC3725
Single-Switch Forward
Controller and Gate Driver
DESCRIPTIO
The LTC®3725 is a controller for a single-switch forward
converter and includes an on-chip gate driver.
For secondary-side control, combine the LTC3725 with
the LTC3706 PolyPhase® secondary-side synchronous
forward controller to create a complete forward converter
using a minimum of discrete parts. A proprietary scheme
is used to multiplex gate drive signals across the isolation
barrier through a tiny pulse transformer. The on-chip
rectifier and the same pulse transformer provide gate drive
bias power.
Alternatively, the LTC3725 can be used as a standalone
voltage mode controller in a primary-side control architec-
ture with optoisolator feedback. Voltage feedforward pro-
vides excellent line regulation and transient response.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
PolyPhase is a registered trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Patent Pending
TYPICAL APPLICATIO
VIN+
36V TO 72V
1µF
100V
×2
VIN–
36V-72V to 3.3V/30A Isolated Single-Switch Forward Converter
T1
L1
0.85µH
Si7450DP
0.030
1W
2.2nF
200V
HAT2165
×2
0.0012
1W
HAT2165
×2
B0540W
1.2
1/4W
100µF
6.3V
×2
10µF
365k
15k
100k
FDC2512
NDRV GATE IS
VCC
FB/IN+
UVLO LTC3725
1µF
SSFLT
FS/IN
VSLMT PGND GND
33nF
0.1µF
T2
••
5.1k
162k
L1: PULSE PA1294.910
T1: PULSE PA0815
T2: PULSE PA0297
FCX491A
2.2µF
1µF
FG SW IS–
IS+
PT+
SG VIN NDRV VCC MODE
LTC3706
FB
PT
GND PGND RUN/SS SLP REGSD FS/SYNC PHASE ITH
33nF
100k
470pF
3.3k
47nF
VOUT+
3.3V
30A
+
220µF
6.3V
VOUT–
2.74k
604
3725 TA01
3725fa
1


Linear Technology Electronic Components Datasheet

LTC3725EMSE Datasheet

Single-Switch Forward Controller and Gate Driver

No Preview Available !

LTC3725
ABSOLUTE AXI U RATI GS
(Note 1)
Power Supply (VCC) ...................................– 0.3V to 15V
External NMOS Drive (NDRV) ....................– 0.3V to 20V
NDRV to VCC ........................................................... – 0.3V to 5V
Soft-Start Fault, Feedback,
Frequency Set, Transformer
Inputs (SSFLT, FB/IN+, FS/IN) ..................– 0.3V to 15V
All Other Pins (VSLMT, IS, UVLO) .................– 0.3V to 5V
Peak Output Current <1µs (GATE) ............................. 2A
Operating Ambient Temperature Range .. – 40°C to 85°C
Operating Junction Temperature (Note 2) ............ 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
UVLO 1
SSFLT 2
NDRV 3
FB/IN+ 4
FS/IN5
TOP VIEW
11
10 IS
9 VSLMT
8 VCC
7 GATE
6 PGND
MSE PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER
LTC3725EMSE
LTC3725IMSE
MSE PART MARKING
LTBSV
LTBSW
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 12V, GND = PGND = 0V, TA = 25°C, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC Supply, Linear Regulator and Trickle Charger Shunt Regulator
VCCOP
Operating Voltage Range
VCCLR
Output Voltage
Linear Regulator in Operation
INDRV
Current into NDRV Pin
Linear Regulator in Operation
tr(VCC)
Rise Time of VCC
Linear Regulator Charging (0.5V to 7.5V)
INDRVTO
Linear Regulator Time Out Current Threshold Primary-Side Operation
ICC
Supply Current
VUVLO = 1.5V, Linear Regulator in
Operation (Note 3)
7
12
15
V
8
V
0.1
1
mA
45
µs
0.27
mA
1.4
2.1
mA
ICCM
VCCSR
ICCSR
Maximum Supply Current
Maximum Supply Voltage
Minimum Current into NDRV/VCC
VUVLO = 1.5V, Trickle Charger in Operation,
VCC = 13.2V (Note 3)
Trickle Charger Shunt Regulator
Trickle Charger Shunt Regulator, VCC = 15V
(Note 3)
1.7
2.5
mA
14.25 15
V
10
mA
Internal Undervoltage
VCCUV
Internal Undervoltage Threshold
Gate Drive Undervoltage
VCC Rising
VCC Falling
5.3
V
4.7
V
VGDUV
Gate Drive Undervoltage Threshold
Undervoltage Lockout (UVLO)
VCC Rising (Linear Regulator)
VCC Rising (Trickle Charger)
VCC Falling
7.2
7.4
7.7
V
13.1 13.4
14
V
6.8
7.0
7.2
V
VUVLOR
VUVLOF
Undervoltage Lockout Threshold Rising
Undervoltage Lockout Threshold Falling
Rising
Falling
1.220 1.242 1.280
V
1.205 1.226 1.265
V
3725fa
2


Part Number LTC3725EMSE
Description Single-Switch Forward Controller and Gate Driver
Maker Linear
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