Rectifier turn on/off thresholds set with external
resistors
Minimum ON and OFF time to minimize GATE turn-
on oscillation
UVLO configurable to 9V or 4V
Wide supply range 4.5V to 24V
Gate drive internally limited to 5V or 10V
2A sink, 1A source gate drive
2mm x 2mm DFN-8 & 4mm x 5mm SOIC-8 packages
Product is lead-free, Halogen Free, RoHS / WEEE
compliant
Description
TS4305 is a synchronous rectifier controller for AC-DC power
supply’s secondary side rectification.
Specifications
•
•
Drives low or high side N-channel MOSFET
Sync-FET control based on current sensing in low or
high-side sense resistor
-40°C to +125°C T
J
operation
Operation to 24V
2A/1A sink/source gate drive
5 V or 10V gate drive capability
100ns propagation delay between current sense to
GATE drive
180μA (typical) quiescent current in low power mode
Under voltage lock out protection
Over temperature shut down (TSD) protection
•
•
•
•
•
•
•
•
Applications
•
•
LLC converters
Flyback converters
Typical Application Circuit
Vout
Snubber
AC
VCC
22Ω
Rsense
GND
Flyback
Converter
Controller
VSS
DRIVE
FB
ISENSE
1Meg
Rgain
Rhyst
TS4305
CS_GND
CS
VDD_BYP
HI
ISET
Rfeed back
GATE
VCC
GND
Ciset
Cvccbypass
Vout
feedback
Cbypass
TS4305
Final Datasheet
August 29, 2017
Rev 2.0
1 of 13
Semtech
Pin Configuration
DFN-8
(Top View)
SOIC-8
(Top View)
Pin Configuration
DFN-8/SOIC-8
Pin #
1
2
3
4
5
6
7
8
Pin Name
CS_GND
CS
VDD_BYP
HI
GND
VCC
GATE
ISET
Function
Current Sense
Current Sense
Power Bypass
Vendor Test Mode
Ground
Power Input
FET Gate Drive
Current Sense Output
Description
Current sense resistor high-side terminal
Current sense resistor low-side terminal
External bypass capacitor for internal 5V VDD supply
Tie to VCC through 1Meg resistor
Circuit Common
Supply voltage
Gate drive, regulated voltage swing
Current sense in voltage form using Rfeedback
TS4305
Final Datasheet
August 29, 2017
Rev 2.0
2 of 13
Semtech
Functional Block Diagram
Functional Diagram Configured in QR Flyback application
TS4305
Final Datasheet
August 29, 2017
Rev 2.0
3 of 13
Semtech
Absolute Maximum Ratings
Over operating free–air temperature range unless otherwise noted (1, 2)
Parameter
VCC
GATE
ISET, CS, HI, VDD_BYP
Electrostatic Discharge – Human Body Model
Electrostatic Discharge – Charge Device Model
Reflow or solder Temperature (soldering, 10 seconds)
Value
-0.3 to 26
-0.3 to 12
-0.3 to 5.5
+/-2k
+/-500
260
Unit
V
V
V
V
V
°C
(1) Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and functional
operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute–maximum–rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to GND.
Thermal Characteristics DFN-8
Symbol
θ
JA
T
STG
T
J MAX
T
A
T
J
(1)
Parameter
Thermal Resistance Junction to Air (1)
Storage Temperature Range
Maximum Junction Temperature
Operating Ambient Temperature Range
Operating Junction Temperature Range
Value
70
-65 to 150
150
-20 to 85
-20 to 125
Unit
°C/W
°C
°C
°C
°C
Assumes 8LD DFN mounted on a 4-layer FR4 2S2P JEDEC board as per JESD51-7 with 13.5 inch
2
of 1 oz Cu.
Thermal Characteristics SOIC-8
Symbol
θ
JA
T
STG
T
J MAX
T
A
T
J
(1)
Parameter
Thermal Resistance Junction to Air (1)
Storage Temperature Range
Maximum Junction Temperature
Operating Ambient Temperature Range
Operating Junction Temperature Range
Assumes 8LD SOIC mounted on a 1-layer FR4 2S2P JEDEC board as per JESD51-7 with 13.5 inch
2
of 1 oz Cu.
Value
153
-65 to 150
150
-40 to 85
-40 to 125
Unit
°C/W
°C
°C
°C
°C
Recommended Operating Conditions
Symbol
VCC
CS
dv/dt
CS
Input
C
VCCBYP1
C
VCCBYP2
C
byp
F
switch
Parameter
Input Operating Voltage
CS Input Slew Rate
CS Input voltage with respect to GND
VCC Bypass Capacitor, appropriate voltage rating per VCC
VCC Bypass Capacitor, appropriate voltage rating per VCC
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