LN3C63 Datasheet PDF - LIEMIC

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LN3C63
LIEMIC

Part Number LN3C63
Description High Performance Current Mode PWM Controller
Page 13 Pages


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LN3C63
High Performance Current Mode PWM Controller
Cycle Turning+
POWER FROM LIEMIC
For,
Adaptor & Charger
Offline Power Supply
Open Frame Power
DVD&DVB Player
Auxiliary Power for PC
etc.....
© 2008 LIEMIC Semiconductor Co.,Ltd.
LN3C63AD
REV: 1.0.0
Free Datasheet http://www.datasheet4u.net/



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POWER FROM LIEMIC
High Performance Current Mode PWM Controller
Cycle Turning+
GENERAL DESCRIPTION
LN3C63 is a highly integrated current mode PWM
control IC optimized for high performance, low
standby power and cost effective offline flyback
converter applications in less than 35W range.
PWM switching frequency at normal operation is
externally programmable and trimmed to tight range.
At no load or light load condition, the IC operates in
extended burst modeto minimize switching loss.
Lower standby power and higher conversion
efficiency is thus achieved. VDD low startup
current and low operating current contribute to a
reliable power on startup design with LN3C63. A
large value resistor could thus be used in the startup
circuit to minimize the standby power. The internal
slope compensation improves system large signal
stability and reduces the possible sub-harmonic
oscillation at high PWM duty cycle output.
Leading-edge blanking on current sense input
removes the signal glitch due to snubber circuit
diode reverse recovery and thus greatly reduces the
external component count and system cost in the
design. LN3C63 offers complete protection
coverage with automatic self-recovery feature
including Cycle-by-Cycle current limiting (OCP),
over load protection (OLP), VDD over voltage clamp
and under voltage lockout (UVLO). The Gate-drive
output is clamped to maximum 18V to protect the
power MOSFET. Excellent EMI performance is
achieved with LIEMIC proprietary Cycle Turning
technique together with soft switching control at the
totem pole gate drive output.
Tone energy at below 20kHz is minimized in the
design and audio noise is eliminated during
operation. LN3C63 is offered in SOT23-6, SOP8
and DIP8 packages.
FEATURES
u LIEMIC Proprietary Cycle Turning Technology
for Improved EMI Performance.
u Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power Design
u Audio Noise Free Operation
u External Programmable PWM Switching
Frequency
u Internal Synchronized Slope Compensation
u Low VDD Startup Current and Low Operating
Current
u Leading Edge Blanking on Current Sense Input
u VDD Over Voltage Clamp and Under Voltage
Lockout with Hysteresis (UVLO)
u Gate Output Maximum Voltage Clamp (18V)
u Line Input Compensated Over Universal Input
Voltage Range.
u Cycle-by-Cycle Over-current Threshold Setting
For Constant Output Power Limiting Over
Universal Input Voltage Range.
u Overload Protection (OLP)
APPLICATIONS
PACKAGE DESCRIPTION
u Offline AC/DC flyback converter
u Battery Charger
u Power Adaptor
u Set-Top Box Power Supplies
u Open-frame SMPS
Part
LN3C63D
LN3C63M
LN3C63P
Description
DIP8 Pb Free
SOP8 Pb Free
SOT23-6 Pb Free
T.R.Rating
90/W
150/W
200/W
ORDER INFOMANTION
LN3C63 X X
| | |_____ Packing Type: T:TUBE; R:Tape & Reel
| |________ Package Type: D:DIP8; M:SOP8; P:SOT23-6
|______________ LIEMIC N Series AC/DC Controller
© 2008 LIEMIC Semiconductor
April 1, 2008
Document Order Number:
- 2 - LN3C63AD
Free Datasheet http://www.datasheet4u.net/



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POWER FROM LIEMIC
PIN CONFIGURATION
High Performance Current Mode PWM Controller
Cycle Turning+
PIN ASSIGNMENTS
Pin Number
SOP8 & DIP8 SOT23-6
16
25
3/
44
53
6/
72
81
Pin Name
GATE
VDD
NC
SENSE
RI
NC
FB
GND
Function
Description
O Totem-pole drive output for the power MOSFET.
P Chip DC power supply pin
/
Current sense input pin. Connected to MOSFET
I
current sensing resistor node.
Internal Oscillator frequency setting pin. A resistor
I connected between RI and GND sets the PWM
frequency.
/
Feedback input pin. The PWM duty cycle is
I determined by voltage level into this pin and SENSE
pin input.
P Ground
MARKING INFOMATION
LN3C63
YYWWZ
© 2008 LIEMIC Semiconductor
April 1, 2008
63YYWW
YY: Year Code, 01-99à2001-2099
WW: Week Code, 01-52 Week
Z: Other Information
-3-
Document Order Number:
LN3C63AD
Free Datasheet http://www.datasheet4u.net/



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POWER FROM LIEMIC
High Performance Current Mode PWM Controller
Cycle Turning+
ABSOLUTE MAXIMUM RATINGS *
VDD DC Supply Voltage ·························································································································· 28V
VDD Clamp Voltage ································································································································· 28V
VDD DC Clamp Current ························································································································ 10mA
VFB Input Voltage··························································································································· -0.3 to 7V
VSENSE Input Voltage to Sense Pin······························································································· -0.3 to 7V
VRI Input Voltage to RI Pin·············································································································· -0.3 to 7V
Min/Max Operating Junction Temperature TJ ·············································································· -20 to 150
Min/Max Storage Temperature Tstg ···························································································· -55 to 160
ESD INFORMATION:
HBM Human Body Model ···················································································································2.5KV
MM Machine Model ····························································································································· 200V
Note: Stresses beyond those listed under absolute maximum ratingsmay cause permanent damage to the device.
These are stress ratings only, functional operat ion of the device at these or any other conditions beyond those indicated
under recommended operating conditionsis not im plied. Exposure to absolute maximum-rated conditions for ex tended
periods may affect device reliability.
RECOMMENDED OPERATING CONDITION
Symbol
Parameter
VDD
VDD Supply Voltage
RI RI Resistor Value
TA Operating Ambient Temperature
Min
Type
Max
Unit
10 25 V
100 KΩ
-20 85
BLOCK DIAGRAM
VDD
UVLO
REF
RI OSC
Cycle
Turning
GND
Burst
Contraller
VDD
SQ
RQ
OLP
Driver
GATE
V OC_REF
Line
OC Compensation
PWM
Slope
Compensation
L.E.B.
VF
Sense
FB
© 2008 LIEMIC Semiconductor
April 1, 2008
-4-
Document Order Number:
LN3C63AD
Free Datasheet http://www.datasheet4u.net/



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