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PDF SD6701ASTR Data sheet ( Hoja de datos )
| Número de pieza | SD6701ASTR | |
| Descripción | NON-ISOLATED BUCK LED LIGHTING DRIVE IC | |
| Fabricantes | Silan Microelectronics | |
| Logotipo |  |
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Silan
Microelectronics
SD670X_Datasheet
NON-ISOLATED BUCK LED LIGHTING DRIVE IC WITH LOW POWER ANG HIGH
CONSTANT CURRENT ACCURACY
DESCRIPTION
SD670XS is designed for non-isolated LED driving with floating Buck
structure, and high constant current accuracy and high linear/load
regulation available with assistant of special sense technology.
SD670XS integrates various protections, such as output open circuit
protection, cycle-by-cycle current limit protection and over temperature
protection.
The start-up current and operating current are low and highlight LED can
be driven with high efficiency in full range (85VAC~265VAC).
SD670XS integrates high voltage power MOSFET, reducing the system
cost and the whole volume.
SOP-7-225-1.27
FEATURES
Built-in 500V high voltage power MOSFET
Constant current with high accuracy for LED (<±3%)
Output open circuit protection
CS open circuit protection
VCC undervoltage protection
Over temperature protection
Cycle-by-cycle current protection
No auxiliary winding
APPLICATION
Bulb Lamp
T5/T8 LED Lamp
Various LED Lighting
ORDERING INFORMATION
Part No.
SD6701ASTR
SD6701STR
SD6702STR
SD6703STR
SD6704STR
Package
SOP-7-225-1.27
SOP-7-225-1.27
SOP-7-225-1.27
SOP-7-225-1.27
SOP-7-225-1.27
Material
Halogen free
Halogen free
Halogen free
Halogen free
Halogen free
Packing
Tape&Reel
Tape&Reel
Tape&Reel
Tape&Reel
Tape&Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
http: //www.silan.com.cn
Rev.:1.5
Page 1 of 7
1 page  
Silan
Microelectronics
SD670X_Datasheet
Boundary-conduction mode
SD670XS works in boundary-conduction mode with strong anti-interference and high conversion efficiency. Auxiliary
winding is unnecessary to detect zero-crossing current and the peripheral circuit is simple. Due to the
boundary-conduction mode, part of harmonic oscillation energy generated by external switch is transferred to VCC.
Current detection and LEB
With the cycle-by-cycle current limit function, Internal switch M1 will be turned off if CS voltage exceeds 0.55V. System
still works and internal switch M1is turned on in the next period. There is no LEB for current limit comparator.
CS voltage and COMP voltage are compared by COMP comparator, if CS voltage is higher than COMP, internal switch
M1 is off and system keeps work. During the instant of turning on internal switch M1, 0.6us LEB is used for avoiding
the error operation on internal switch M1.
CS open/short circuit protection
If CS resistor is shorted, there is no limit for inductor current, voltage on pin CS is zero,and the short-circuit is judged
by checking voltage during on of internal OUT signal.
Gate driver
Gate drive is adopted for this IC. Gate of M2 is connected to VCC through a resistor, Source is connected to Drain of
internal switch M1. When Gate of internal switch M1 is driven by IC, the IC current can be reduced because of the low
gate capacitance of M1, and hence no auxiliary winding is needed.
Output short/open circuit protection
There is no signal which reflects the output, the IC detects the discharge time for judging over voltage. The over
voltage protection threshold value is set through pin ROVP. ROVP pin should be grounded via a pull-down resistor,
floated is not allowed. Please refer to application note for resistance range and detailed operations..
If IC detect the output short and counts for 16T, it is judged as output short, the system is turned off for restart.
Internal temperature regulatory
The output current will be reduced of the IC temperature exceeds the certain value.
TYPICAL APPLICATION CIRCUIT
AC
INPUT
4 VCC DRAIN 5
3 CS DRAIN 6
2 NC
1 ROVP GND 7
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
http: //www.silan.com.cn
Rev.:1.5
Page 5 of 7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet SD6701ASTR.PDF ] | |
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