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PDF CS6552 Fiche technique - Semico

Numéro de référence CS6552
Description A High Precision Primary Side feedback Constant Current Control LED Controller
Fabricant Semico 
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CS6552 Datasheet, Description
MOS IC
CS6552
A High Precision Primary Side feedback Constant
Current Control LED Controller
The Document is Applied to: CS6552AEO,CS6552BEO,CS6552EO,CS6552CEO,CS6552DEO
1General Description
The CS6552 is a high precision primary-side-feedback LED lighting controller which
integrates a 600V high voltage power MOSFET, it achieves 85Vac-265Vac input voltage and
accurate LED current for single-power stage, isolated lighting applications. The constant
current control method accurately controls the LED current from the primary side, and therefore
significantly simplifies the LED lighting system design by eliminating the secondary side
feedback components and opto-coupler. It also eliminates the need of loop compensation circuit
while maintaining stabilityand increase the reliability.
The CS6552 works in discontinuous conduction mode to reduce the MOSFET switching
losses. The extremely low start-up current and quiescent current reduces the total power
consumption to provide a high efficiency solution for lighting applications.
The multi-protection feature of CS6552 significantly improves the system reliability and
safety. The CS6552 features over-voltage protection, short-circuit protection, cycle-by-cycle
current limit, VCC UVLO and over-temperature protection. The CS6552 will auto-restart when
protection happens.
Features
Integrate 600V high voltage power MOSFET
Primary-side-control Without Secondary-feedback Circuit
High Precision LED Output current for 85Vac-265Vac Input Voltage
Ultra-low(23μA) Start Up Current
Discontinuous Conduction Mode Improves Efficiency
Low(<1.5mA) Quiescent Current
Leading Edge Blanking Function
Output Open/Short Circuit Protection
Current Detect Resistor Open Circuit Protection
Cycle-by-cycle Current Limit Protection
VCC UVLO Protection
VCC Over Voltage Protection
Over-temperature Protection
Available in SOP8 Package
VersionS-2014-04-E
Wuxi CR Semico Co.,Ltd
Page 1 of 8
CS6552 Fiche technique
MOS IC
CS6552
NTurn ratio of primary side to secondary side
VREFThe CS detect threshold voltage (typical 0.48V)
RCSThe sensing resistor connected between CS pin and GND
2.2.3System Frequency
The CS6552 works in discontinuous conduction mode, the recommended frequency is
40kHz~48kHz. The maximal and minimal frequency is limited by CS6552. The system
frequency expression is:
f
=
8*
VLED
I LED *
LP
*
N
N
2
P
2
S
2.2.3Leading Edge Blanking
In order to avoid the premature termination of the switching pulse due to the parasitic
capacitance discharging at MOSFET turning on, an internal leading edge blanking(LEB) unit is
employed between the CS pin and the current comparator input. During the blanking time, the
path from CS pin to the current comparator input is blocked.
VCS
TLEB
t
2.2.4LED open Protection
When the LED open circuit happens, VCC voltage will raise up to higher than VCC on
voltage, the Vcc capacitance will discharge through the interior circuit. The Vcc will be
clamped at about 14.5V and the output voltage is proportional to Vcc, the output voltage is
given by the following equation:
Vout = (Vcc +VDa) × N -VDo
N is the turn ratio of the output winding to the auxiliary winding
VDa is the auxiliary rectifier diode forward drop voltage
VD is the output rectifier diode forward drop voltage
If the Vcc voltage raises to higher than VCC overvoltage protection threshold, the output
power MOSFET will be turned of and be locked. The system will restart again until the error
condition is removed.
2.2.5LED short Protection
When the LED is shorted to ground, the output voltage is clamped to zero. The auxiliary
VersionS-2014-04-E
Wuxi CR Semico Co.,Ltd
Page 3 of 8

3 Page

CS6552 pdf
MOS IC
CS6552
Continued
Symbol
Parameter
Condition
Min Typ Max Units
Power MOS
The turn-on resistor of
RON
integrated high
voltage power
MOSFET
Over Temperature Protection
TSD
Over temperature
protection threshold
TSD_HYS
Temperature
hysteresis
CS6552AEO
CS6552BEO
CS6552EO
CS6552CEO
CS6552DEO
VCC=10V
IOUT=0.25A
VCC=10V
IOUT=0.4A
VCC=10V
IOUT=0.5A
VCC=10V
IOUT=0.75A
VCC=10V
IOUT=1A
24 30
11 15
9 10.5
8.5 10
67
160
30
4Typical Application Circuit and Information
VersionS-2014-04-E
Wuxi CR Semico Co.,Ltd
Page 6 of 8

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Un datasheet est un document fourni par le constructeur du composant, où figurent toutes les données techniques sur le produit: puissance dissipée, courant maximal, tension de seuil, tension de claquage, température de stockage, etc.


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