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3110
WS
WS3110
WS3110 High Performance LED Driver
Features
General Description
■ Fast start-up time
■ Low operation current (0.6mA)
■ PSR control with Single stage PFC topology
■ CC±5%
■ Programmable output current and output voltage
■ Internal Line and Load compensation
■ Internal soft-start
■ Built in Leading edge blanking (LEB)
■ Cycle-by-cycle Over-Current Protection
■ VCC over-voltage protection (VCC-OVP)
■ VCC under voltage lockout (UVLO）
■ Over temperature protection (OTP)
■ Transformer saturation protection
■ Inter power-mos saturation protection
■ Output LED open/short protection
■ CS pin open/short protection
WS3110 is a power factor correction，primary-side-control
LED lighting driver with advanced features to provide high
efficiency control for lighting application.
WS3110 applies source driver technology，its internal fast
start-up circuit greatly shorten the start-up time while
keeping extremely low standby power consumption.
With internal line-compensation, the WS3110 provides
accurate constant current (CC ± 5%) regulation at
universal AC input.
WS3110 offers complete protection coverage with
automatic self-recovery feature including cycle by cycle
over current protection (OCP), VCC over-voltage
protection (VCC-OVP) and under voltage lockout (UVLO),
output LED short/open protection, CS pin short/open
protection, and over-temperature protection (OTP). The
gate-driven output ST is clamped to maximum 15V to
protect the external MOSFET. Excellent EMI performance
is achieved by using soft-driver technology.
WS3110 is offered in SOP-8 packages.
Applications
■ LED lighting
■ Down light
■ Tube lamp
■ PAR lamp
■ Bulb
Typical Application Circuit
cs
ST
gnd Source
comp
vcc
mult
ZCD
W/T-S023-Rev.A/2 Mar.2013
Copyright@Winsemi Microelectronics Co., Ltd., All right r eserved.
0313
3110
WS
WS3110
Pin Definition and Device Marking
WS3110 is offered in SOP-8 packages，as shown below：
WS3110S8P:
A: Product Code
X: Internal Code
B：Area Code
YM：Year Month
Pin Function Description
Pin Name
Pin No.
Pin Type
/SOP8
DIP8
DIP8/SOP8
Function Description
CS
1
I
Current sense input pin
GND
2
P
COMP
3
I/O
MULT
4
I
ZCD
5
I
VCC
6
P
Ground. pin of the IC
Output of the error amplifier, connect a capacitor to ground for loop
compensation
Input of the multiplier, connect this pin to line voltage via a resistor
divider to detect the sinusoidal line voltage
Zero current detection and out voltage feedback pin, connect this
pin through a resistor divider from the auxiliary winding to ground, It
use for out voltage feedback
Supply voltage of the IC
ST
7
P
Start-up pin ,connect to the gate of power-mos
Source
8
O
Source driver output, connect to the source of power-mos
Block Diagram
c s 15
ut
8 oSource
L i ne
compensation
S& H
Current
control
REF
GM
PWM
L ogi c
&
driver
C lamp
@ 2V
L oa d
compensation
Second-on
detect
LED
s hort
com p 3
Start up
2
gnd
7
ST
58 Z C D
LED
OVP
m ult 4
Mult
Transformer
saturation
protect
U V LO
Inter
s uppl y
6
v cc
2/8
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3110
WS
WS3110
Ordering Information
Package
8-Pin SOP8,
Pb-free
IC Marking Information
Purchasing Device Name
WS3110S8P
WS3110S8P
Recommended Operating Condition
Symbol
Parameter
Value
Unit
VCC
VCC Supply Voltage
10~25
V
TA
Operating temperature
-20~85
℃
Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
VCC
DC Power Supply
25
V
V ZCD
ZCD input voltage
-0.3~7
V
V CS
CS input voltage
-0.3~7
V
V COMP
COMP input voltage
-0.3~7
V
V M ULT
MULT input voltage
-0.3~7
V
V ST
ST input voltage
15
V
V Source
Soruce input voltage
25
V
TJ
Operation Junction Temperature
-20~150
℃
TSTG
Storage Temperature
-40~150
℃
IST
ST Clamp Continuous Current
10
mA
Note 1: Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device.
These are stress ratings only, functional operation of the device at these or any other conditions beyond those indicated in
the Recommended Operating Conditions section are not implied. Exposure to absolute maximum-rated conditions for
extended periods may affect device reliability.
ESD Information
Symbol
Parameter
Value
Unit
V ESD-HBM
Human body model on all pins
2
KV
V ESD-MM
Machine model on all pins
200
V
3/8
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3110
WS
WS3110
Electrical Characteristics(Unless otherwise specified，TA=25℃，V CC=16V)
Supply Voltage (VCC)
symbol
parameter
Test condition
I_VCC_ST
Start up current
I_VCC_OP
Typ
Max
Unit
VCC=( UVLO_OFF -1)V
40
70
uA
Operation Current
Fsw=60KHz
0.6
1.2
mA
Iq
Static Current
VCC=14V, No switching
0.32
0.6
mA
UVLO_ON
Turn on threshold Voltage
VCC falling
5.2
5.8
6.5
V
UVLO_OFF
Turn-off threshold Voltage
VCC rising
10
11
12
V
VCC_hold
VCC hold voltage
VCC falling
7
7.5
8
V
Over
voltage
Min
protection
OVP
Ramp VCC until no-switching
25.8
V
Threshold
Start up section (ST)
ST_clamp_be
ST clamp before UVLO
Ist=1mA ，VCC=10V
16
17
18
V
ST_clamp_af
ST clamp after UVLO
VCC=14V
14
15
16
V
IST_be
IST before UVLO
ST=14V，VCC=10V
20
35
uA
IST_af
IST after UVLO
ST=14V，VCC=14V
35
60
uA
0.3
0.306
V
Error Amplifier Section
V REF
Reference voltage for EA
Comp_clamp
Comp low-clamp voltage
Vcomp
Linear operating range
Vth_short
Output short threshold
0.294
1.5
1.5
V
3.5
4.5
V
V
MULT Section
V M ULT
Linear operating range
0
2.5
V
ZCD Section
VZCD
Demagnetization threshold
ZCD falling
0.4
V
VZCD_hys
VZCD threshold hysteresis
ZCD risind
0.6
V
ZCD_ovp
LED open-protect threshold
5.5
V
Toff_min
Minimum OFF time
4
us
Toff_max
Maximum OFF time
150
us
Vth_ocp
Circle by circle OCP threshold
2.0
V
TLEB
LEB time
350
ns
Td
Delay to output
180
ns
0.3
Ω
CS Section
S Section
Rds_on
VCC=7.5V，Ids=1A
4/8
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3110
WS
WS3110
Inter power mos saturation
Vds_OVP
Vds =(Vsource-Vcs)
2.1
V
3.3
V
150
℃
protection
Transformer
saturation
Vd_OVP
protection
Temperature Section
OTP
Over temperature protection
5/8
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3110
WS
WS3110
Function Description
WS3110 is a primary-side control with single stage PFC
At the secondary ON time, the auxiliary voltage as
controller targeting at LED lighting applications. The
follow :
VAUX =
transition mode control greatly reduces the switch
turn-on loss, improves the conversion efficiency and EMI
N AUX
* (Vo + ∆V )
NS
performance. It provides very good power factor and low
Vo is output voltage , ΔV is the forward voltage of the
THD.
rectifier diode. So that ZCD can sense the output voltage
via the auxiliary winding divider. When ZCD is higher
than 5.5V, the LED open protection is trigger; the system
Startup Current and Startup Control
The line current charge up the ST capacitor via a start-up
will enter automatic self-recovery station.
resistor (the internal start up circuit will consume 20 uA
current), the VCC voltage will follow the ST voltage (ST
is clamp to 16V at start-up stage), and quickly over
UVLO threshold, then the startup circuit is shut down,
VCC get power from auxiliary winding, and ST is clamp
Programmable output Current
The output current can be programmable by adjust the
resistor between CS and GND. The LED output current
is as follow:
I out =
at 14V to driver the power MOS, and the VCC over
N
N
p
S
×
V REF
2 × R CS
voltage threshold is set to be 25.8V. At normal operation
condition, when VCC is lower then 7.5V, the startup
circuit will be wake up to hold the VCC voltage until VCC
While VREF is the reference voltage of the amplifier of
the CC loop, and Rcs is the current sense resistor from
CS pin to GND, Np/Ns is the The turns ratio of the
higher than 8V.
primary and secondary of the transformer.
Operating Current
The operating current of WS3110 is low to 0.6mA .Good
Transition mode and switching frequency
efficiency and low standby power is achieved with low
The WS3110 operates in transition mode, the frequency
operating current
varies depending on the line voltage and the load
condition, and the maximum switching frequency is
Demagnetization ， Line-compensation and output
internal limited by the minimum OFF time (4us) to
voltage detection
250KHz.
By using a auxiliary winding of the transformer, the
During start-up or output short circuit, the output voltage
is too low, and the voltage of ZCD is lower than 0.4V
WS3110 can perform zero current detection. When the
threshold, the demagnetization cannot be detected, then
stored energy is fully released to the output, the voltage
the switching frequency is set by the maximum OFF time
at ZCD decrease. A negative-going edge triggers
(150us) to be 7KHz,
MOSFET’s turn-on
At the primary ON time, the ZCD pin can indirectly detect
Current Sensing and Leading Edge Blanking
the line voltage, and be used to Line-compensation, the
The Cycle-by-Cycle
compensation rate can be programmable by adjust the
WS3110.
current limiting is offered in
upper resistor of the auxiliary winding divider
6/8
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3110
WS
WS3110
The switch current is detected by a sense resistor into
the soft-start is realized. The soft-start time depends on
the SENSE pin. The internal Leading-edge blanking
the value of the compensation capacitor.
chops off the sense voltage spike at initial MOSFET on
state due to snubber diode circuit reverse recovery and
Saturation protection of transformer
thus reduce the external RC filter circuit. The current limit
The Source pin of WS3110 is used to detect the
comparator is disabled and cannot turn off the external
operating state of the transformer and the internal power
MOSFET during the blanking period. PWM duty cycle is
MOS. When the Vds of the internal power mos (voltage
determined by voltage level at comp pin and mult pin.
between Source pin and CS pin) is over 2.1V, the
internal power MOS saturation protection is triggered;
and when the voltage of pin Source is over 3.3V, the
Error Amplifier and soft-start
transformer saturation protection will be triggered
The comp pin is the error amplifier output of WS3110,
and a 1 uF capacitor is connect from comp to GND to
Protection Controls
make the CC loop stable.
Good power supply system reliability is achieved with
During the startup period, an internal 300uA current will
auto-recovery protection features including cycle by
quickly charge up comp to 1.5V, then the CC loop will
cycle over current protection (OCP), VCC over-voltage
adjust the comp voltage according to the load condition.
protection (VCC-OVP)
Since the sink/source current of the error amplifier is
(UVLO), output LED short/open protection, CS pin
very small, the voltage of comp will rise slowly after
short/open protection, and over-temperature protection
startup, and the PWM duty also increase slowly, so that
(OTP).
and under
voltage lockout
7/8
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3110
WS
WS3110
SOP-8 Package Information
B2
0 . 5 * 0.125±0. 05
球形标记
A1
A2
D
D1
B
B1
A
C4
A3
R2
C
C1
θ4
C2
θ2
R1
θ1
C3
θ3
Winsemi
Symbol
Dimensions in Millimeters
Dimensions in Inches
Min
Max
Min
Max
A
4.70
5.10
0.185
0.201
B
3.70
4.10
0.146
0.161
C
1.30
1.50
0.051
0.059
A1
0.35
0.48
0.014
0.019
A2
1.27TYP
0.05TYP
A3
0.345TYP
0.014TYP
B1
5.80
B2
6.20
0.228
5.00TYP
0.244
0.197TYP
C1
0.55
0.70
0.022
0.028
C2
0.55
0.70
0.022
0.028
C3
0.05
0.225
0.002
0.009
C4
0.203TYP
0.008TYP
D
1.05TYP
0.041TYP
D1
0.40
0.80
0.016
0.031
8/8
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