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D-K381C8
Non-isolated Quasi-Resonant Buck LED Power Switch with OVP
FEATURES
Proprietary Output OVP Protection
Integrated with 500V MOSFET
No Auxiliary Winding Needed
Quasi-Resonant for High Efficiency
Built-in Thermal Foldback
Built-in Charging Circuit for Fast Start-Up
±4% CC Regulation
Very Low VDD Operation Current
Built-in AC Line CC Compensation
Build in Protections:
LED Short/Open Protection
On-Chip Thermal Fold-back (OTP)
Cycle-by-Cycle Current Limiting
Leading Edge Blanking (LEB)
Pin Floating Protection
VDD UVLO
Available with SOP8 Package
APPLICATIONS
LED Lighting
TYPICAL APPLICATION CIRCUIT
GENERAL DESCRIPTION
D-K381C8 is a highly integrated power switch
with Quasi-Resonant Buck (QR-Buck) constant
current (CC) control for LED lighting applications.
The IC has built in output Over Voltage
Protection (OVP).
D-K381C8 combines a 500V power MOSFET
switch with a power controller in one chip. The IC
also integrates high voltage startup/IC supply
circuit and a novel transformer demagnetization
circuit, which eliminates transformer auxiliary
winding. The IC adopts Quasi-Resonant control
for high efficiency.
D-K381C8 integrates functions and protections
of Current Limit and Leading Edge Blanking,
Under Voltage Lockout (UVLO), Cycle-by-cycle
Current Limiting (OCP), Thermal Foldback (OTP),
Output OVP, LED Open/Short Protection, etc.
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D-K381C8
Non-isolated Quasi-Resonant Buck LED Power Switch with OVP
Pin Configuration
Marking Information
K381C8 for product name;
XXXXXX : The first X reresents the last year,2014 is 4; The second X represents the month, in A-L
12 letters;The third and fourth X on behalf of the date, 01-31 said; The last two X represents the
wafer batch code.
Output Power Table
Part Number Package
D-K381C8
SOP8
Output Current for
90-265Vac
36V output 72V output
Output Current for
176-265Vac
150V output 200V output
Minimum
Output
Voltage
180 mA
150 mA
120 mA
100 mA
15V
Pin Description
Pin
Number
Pin Name
I/O
Description
1 NC - No Connection.
2
Rovp
I
Over Voltage Protection Setting Pin. Connect a Resistor to System
GND.
3 NC - No Connection.
4
VDD
P Power Supply Pin of the Chip.
5-6 Drain I Internal Power MOSFET Drain.
7-8 CS P The Ground of the IC. This pin is also used for peak current control.
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D-K381C8
Non-isolated Quasi-Resonant Buck LED Power Switch with OVP
Block Diagram
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D-K381C8
Non-isolated Quasi-Resonant Buck LED Power Switch with OVP
Absolute Maximum Ratings (Note 1)
Parameter
VDD DC Supply Voltage
Drain pin
Rovp pin
Package Thermal Resistance (SOP8)
Maximum Junction Temperature
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10sec.)
ESD Capability, HBM (Human Body Model)
ESD Capability, MM (Machine Model)
Recommended Operation Conditions (Note 2)
Parameter
Operating Junction Temperature
Value
8.5
-0.3 to 500
-0.3 to 8.5
165
175
-40 to 105
-65 to 150
260
3
250
Unit
V
V
V
/W
kV
V
Value
-40 to 125
Unit
Electrical Characteristics (Ta = 25, If Not Otherwise Noted)
Symbol Parameter
Test Conditions
Min Typ. Max Unit
Supply Voltage Section(VDD Pin)
IVDD_ST
Startup Current
VDD=6.5V
700 uA
IVDD_Op
Operation Current
140 260 uA
VDD_Op
VDD Operation Voltage
6.8 7.3 7.8
V
VDD_OFF VDD Under Voltage Lockout Enter
5.3 V
Timing Section
Ton_max Maximum On Time
32 us
Toff_min
Minimum OFF Time
2.5 us
Toff_max
Maximum OFF Time
300 us
Tdem_OVP Off Time OVP Trigger Threshold
5 us
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D-K381C8
Non-isolated Quasi-Resonant Buck LED Power Switch with OVP
Current Sense Input Section (CS Pin)
TLEB
CS Input Leading Edge Blanking
Time
Vcs(max) Current limiting threshold
TD_OCP
Over Current Detection and
Control Delay
Output OVP Section (Rovp Pin)
VROVP
Rovp Pin Floating Voltage
Over Temperature Protection
TSD Thermal Foldback Trigger Point
(Note 3)
500 ns
490 500 510 mV
100 ns
5.7 V
165
Power MOSFET Section (Drain Pin)
VBR
Rdson
Power MOSFET Drain
Breakdown Voltage
Static
Drain-Source
Resistance
Source
On
I(Drain)=50mA
500
12
V
ohm
Note1. Stresses listed as the above "Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to maximum rating conditions for extended periods
may remain possibility to affect device reliability.
Note2. The device is not guaranteed to function outside its operating conditions.
Note3. Guaranteed by design.
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