JW1233 Datasheet_R0.83_EN_20140519
JW1233
Adaptive 100/120Hz Current Ripple Remover
Max Input Current ≤0.5A
Parameters Subject Parameters Subject to Change to Change to Change Without Notice
FEATURES
Adaptive 100/120Hz current ripple remover Input voltage range 5V~60V Built-in 60V power MOSFET
LED voltage low to 0.4V when LED current is 0.35A
Programmable LED current ripple
Programmable maximum LED cathode voltage
Internal LED voltage limit Internal LED current limit Short/Open protection Hot plug protection
Over temperature protection
eSOP8 package
APPLICATIONS
LED lightning
DE S CRIPTION
JW1233 is used to drive a LED string (≤50V), and remove the 100/120Hz current ripple on AC/DC power by a capacitor between VC and GND. If the voltage on LED pin exceeds 6V, the current ripple removing function is disabled, which could help limit the power dissipation on chip. JW1233 provides short protection, open protection and HOT-PLUG protection.
The maximum LED current is internally limited at 0.7A.
JW1233 provides over thermal protection. When OTP is trigged, the internal MOSFET shuts down until the temperature decreases to 120 oC .
C o m p a n y ’s L o g o i s P r o t e c t e d , “J W ” a n d “J O U L W A T T ” a r e R e g i s t e r e d T r a d e m a r k s o f J o u l W a t t t e c h n o l o g y I n c .
TYPICAL APPLICATION
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ORDER ING INFORMATION
LEAD FREE FINISH TAPE AND REEL PACKAGE TOP MARKING JUNCTION
TEMPERATURE RANGE
JW1233ESOP#PBF
JW1233ESOP#TRPBF
eSOP8
JW1233
–40 oC to 150 oC
PIN CONFIGURATION
Top View
eSOP8
ABSOLUTE MAXIMUM RATING 1）
VIN PIN .................................... 60V LED PIN ...........................-0.3V to 60V VC, VLMT ........................... -0.3V to 6V Junction Temperature
2) 3)
..................... 150oC
Lead Temperature ......................... 260 oC Storage Temperature .............－65 oC to +150 oC
RECOMMEND ED OPERATING RANG E
VIN ...................................4.7V to 55V LED pin .................................. <60V Maximum Junction Temperature (T J )...........150oC
THERMAL RESISTANCE 4） θJA JA
θJ C
eSOP8 ........................ 50 ...10 oC /W
Note ：
1) Exceeding these ratings may damage the device.
2)
The JW1233 guarantees robust performance from -40°C to 150°C junction temperature. The junction temperature range specification is assured by design, characterization and correlation with statistical process controls.
3)
The JW1233 includes thermal protection that is intended to protect the device in overload conditions. Thermal protection is active when junction temperature exceeds the maximum operating junction temperature. Continuous operation over the specified absolute maximum operating junction temperature may damage the device. 4)
Measured on JESD51-7, 4-layer PCB.
Package Code
Pb Free
JWXXXXPPPP#TRPBF
Tape and Reel （If “TR” is not shown, it means Tube ） Part Number
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ELECTRICAL CHARATERISTICS
VIN = 12V, TA = 25oC, unless otherwise stated.
Item Symbol Condition Min. Typ. Max. Units V IN Start Up Voltage Threshold V IN_ON9 10 11 V
V IN Start Up Voltage Hysteresis V IN_HYS 4 V
V IN Operation Current I IN I LED=350mA 0.12 0.20 0.34 mA
LED Voltage Limit Threshold V TH_VLMT LED voltage when voltage limit
is trigged
5.4 6
6.6 V
LED Short Protection Threshold V TH_SHORT VSP voltage when short
protection is trigged.
1.8 2
2.2 V
LED Open Protection Threshold I TH_OPEN LED current when open
protection is trigged.
50 mA
LED Short/Open Protection Delay TP 30 45 60 us LED Short Protection hold time TSH 5 7.5 10 ms LED Open Protection hold time TOH 0.2 0.3 0.4 ms Regulated LED Pin Voltage V LEDR I LED=350mA 0.25 0.40 0.65 V LED Current Limit I CLMT0.5 0.7 1.6 A Over Temperature Protection Threshold OTP 140 oC OTP Recovery Threshold 120 oC
PIN DESCRIPTION
eSOP8
eSOP8
Pin No. Name Description
1 NC No Connection
2 LED
Connect to Cathode of LED string
3 LED
4 LED
5 VLMT LED Short Protection Threshold Programming
6 VC LED Current Ripple Programming
7 GND Power Ground
8 VIN Power Supply
(exposed PAD)
GND Power Ground
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TYPICAL PERFORMANCE CHARACTERISTICS
Note ：The pre-driver is JW1600 18W T8 program. The output specification is 40V/460mA with electrolytic capacitor 330uF/63V * 2. The V O noted in the figure is the pre-driver LED voltage, I LED is the output current, and V LED- is the JW1233 LED pin voltage.
LED LED current current w /o JW1233JW1233
(VIN=220V,Io=(VIN=220V,Io=460460460mA mA mA,,Vo=Vo=440V,0V,
electrolytic capacitor
330
330uF/uF/
uF/6363
63V*2V*2
V*2))
current ripple:current ripple:242242242mA,mA,mA,52.652.652.6%%
LED LED current current with with JW1233JW1233
(VIN=220V,Io=(VIN=220V,Io=4646460mA 0mA 0mA,,Vo=Vo=440V,0V,
electrolytic capacitor
330
330uF/
uF/uF/63
63
63V*2V*2
V*2)
)
current ripple:current ripple:110mA,mA,2.22.22.2%%
S ystem ystem E E fficiency comparison with fficiency comparison with and and and
without without JW1233JW1233JW1233
(VIN=220V,Io=(VIN=220V,Io=4646460mA 0mA 0mA,,Vo=Vo=4
40V,0V,
electrolytic capacitor
330
330uF/uF/
uF/6363
63V*2V*2
V*2)
)
LED LED Open Open test test test
LED LED Short test Short test
Pre
Pre-
-driver driver o utput capacitor short test utput capacitor short test
LED LED hot plug test hot plug test
C ontinuous power on/off test ontinuous power on/off test
80
82 84 86 88 90 92 90
110 130 150 170 190 210 230 250
E f f i c i e n c y %VIN(V)
EFFICIENCY VS VIN
W/O JW1233W/+JW1233
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FUNCTIONAL DESCRIPTION
JW1233 is designed for driving one LED string (≤55V) and removing the 100/120Hz LED current ripple.
Theory of Operation
The LED string and JW1233 are both supplied by an AC/DC current source. The LED pin is connected to the cathode of LED string. JW1233 transfers the LED current ripple to voltage ripple on chip, and ensures the constant voltage across LED string and the current flow through LED string.
The scalable adaptive function of JW1233 can regulate the cathode voltage of LED string to minimum to improve the efficiency of the system.
Current Ripple Removing
The capacitor C C between VC and GND is an integral capacitor. JW1233 transform the voltage on C C to a reference voltage. The current regulator regulates LED current via negative feedback control.
The relationship between the voltage on C C and LED current is shown as following:
I LED = V VC * 400 (mA)
C C should be large enough in order to remove the current ripple of the LE
D string. However, too large capacitor may slow down the dynamic response.
Adaptive Regulation
JW1233 controls the voltage on C C by monitoring the operation state of built-in N-MOSFET. The efficiency of system is relatively low when N-MOSFET always works in the saturation region. JW1233 detects it and charges C C to raise the V VC and I LED, then the output voltage of power supply is reduced, and the voltage drop on N-MOSFET decreases. Conversely,
when N-MOSFET is working in the linear region, LED current regulation loop is open. JW1233 detects it and discharges C C to reduce the V VC and I LED, then the output voltage of power supply is raised, and the LED current regulation loop is closed.
LED Pin Voltage Limit
The voltage ripple on LED pin is very large when the current ripple is removed, which could bring large power dissipation on chip. JW1233 limits the voltage on LED pin as 6V internally. When the voltage on LED pin reaches 6V, the current ripple removing function is blocked.
LED Current Limit
The current of LED is limited to 0.7A internally. The current limitation can protect the chip when LED is short connected or HOT-PLUG.
The function of current limit has higher priority than LED Pin voltage limit. It means that the LED voltage is disabled when LED current exceed 0.7A.
LED Short Protection
The resistor divider connected between LED and GND can setup the short protection threshold. When the voltage input to VLMT Pin exceeds 2V
and the state holds for more than 60us, JW1233 considers the LED string is SHORT and shuts down the internal MOSFET.
The shut down state lasts for 10ms. After 10ms, the
SHORT state is reset, and the MOSFET restarts.
The short protection threshold
is calculated as below:
V TH_SP = 2V * (R 1+R 2)/R 2
Open and HOT-PLUG Protection
When JW1233 detects that LED current is lower than 50mA, and the state lasts for more than 60us, JW1233 considers the LED string is OPEN and shuts down the internal MOSFET.
The MOSFET keeps off for 0.5ms and then restarts.
If the LED string is connected back during MOSFET restarts, the OPEN state is reset. The internal MOSFET is turned on and the LED current is limited at 0.7A.
Over Thermal Protection
JW1233 monitors operation temperature. When the temperature is higher than 140℃，the internal MOSFET is shut down until the temperature drop to 120℃.
PCB Design Guideline
1. The bypass capacitor of VIN should be placed
as close as possible to the VIN pin and GND pin of IC.
2. JW1233 should be placed far away from the
power devices such as MOSFET and Diode for better thermal performance.
3. The area of LED current loop should be as
small as possible.
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APPLICATION NOTE
JW1233 design guide:
1. Design considerations:
a) The maximum voltage rating of LED
pin is 60V, so the overvoltage threshold of the pre-driver must be lower than 60V in order to protect the chip in LED short condition.
b) A LED string should be used to test the
characteristics of JW1233 including open and short circuit test.
2. The recommended operating current of
JW1233 is 350mA (max 500mA). The power loss and temperature rise of the chip depend on the amplitude of the output voltage ripple and LED current.
3. Based on the power factor correction of the
pre-driver, the law of energy conservation and reasonable temperature rise of the JW1233, the output capacitance of the pre-driver can be approximately calculated as follows:
P IN :
Input power P OUT :
Output power P D : Power loss of JW1233 I LED : LED current U: Output voltage
V MIN :
the minimum LED pin voltage △U: Peak to peak output voltage ripple V F ： LED voltage V LED -: LED- pin voltage
T: line cycle
η: Efficiency of the system
a) The power factor correction of the
pre-driver and the law of energy conservation:
P ??=(P ???+P ?)/η
①
E =2[P ???T
8??P ??(1?cos2ωt )dt]?/?
?
② b) The energy formula of capacitance:
E =?
??C[?U +
???
????U ?
???
??]
③
c) The reasonable temperature rise of the
JW1233
V ???=I ????R ????
④ P ?≈I ????V ????≈I ????(?U
2
+V ???) ⑤
C =
P ???+P ?
2?π?f ?η?P ?????U ?I ???
⑥
d) The smaller output power, the larger
capacitance is needed as it can be seen in the equation above. e) For example : i. Given ：P D =0.5W (Equivalent to
40℃ temperature rise); η=0.85;
f=1/T=50Hz
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Then, the result shows in the following figure:
ii. Given ：P D =0.8W (Equivalent to 64℃ temperature rise); η=0.85; f=1/T=50Hz, The result shows in the below:
4. JW1233 allows user to setup the Short
Circuit Protection (SCP) voltage via a resistor divider. When the V VLMT is higher than 2V, JW1233 shuts down the MOSFET internal and recovers when V VLMT is lower than 2V. Also, the SCP voltage must meet the following conditions:
V ????V ? V ??? R VIN : the resister between anode of the input and the VIN pin. V INRISING : VIN Start Up Voltage Threshold. 5. The capacitance between VC and GND determines the final current ripple. It should be large enough to remove the LED current ripple. However, too large capacitor may slow down the dynamic response. 1uF or 2.2uF is recommended. 300 600 900 1200 1500 0.1 0.20.30.40.5 O u t p u t c a p a c i t a n c e (u F ) LED current (A) Output capacitance VS LED current @Pd=0.5W POUT=5W POUT=10W POUT=15W POUT=20W 200 400 600 800 0.1 0.2 0.3 0.4 0.5 O u t p u t c a p a c i t a n c e (u F ) LED current (A) Output capacitance VS LED current @Pd=0.8W POUT=5W POUT=10W POUT=15W POUT=20W ying kang ke ji you xian gong si chenS:138******** qq:2995984049 APPLICATION REFERENCE Reference 1： ying kang ke ji you xian gong si chenS:138******** qq:2995984049 PACKAGE OUTLINE eSOP8unit: mm ying kang ke ji you xian gong si chenS:138******** qq:2995984049 IMPORTANT NOTICE Joulwatt Technology Inc. reserves the right to make modifications, enhancements, improvements, corrections or other changes without further notice to this document and any product described herein. Any unauthorized redistribution or copy of this document for any purpose is strictly forbidden. Joulwatt Technology Inc. does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel. When using this product, Joulwatt Technology Inc. has no responsibility for any direct or indirect loss caused by the use of the product or attached material. ying kang ke ji you xian gong si chenS:138******** qq:2995984049 C o p y r i g h t?2014J W1233I n c o r p o r a t e d. A l l r i g h t s a r e r e s e r v e d b y J o u l w a t t T e c h n o l o g y I n c.