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PDF SD7530 Data sheet ( Hoja de datos )
| Número de pieza | SD7530 | |
| Descripción | HIGH POWER FACTOR FLYBACK PWM CONTROLLER | |
| Fabricantes | Silan Microelectronics | |
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SD7530_Datasheet
HIGH POWER FACTOR FLYBACK PWM CONTROLLER
DESCRIPTION
SD7530 is a high power factor flyback PWM controller special for
LED lighting applications.
SD7530 features a high performance analog multiplier for power
factor correction (PFC), zero current detector (ZCD) to ensure TM
operation. It integrates a current sensing comparator with built-in
leading-edge blanking, and a totem-pole output stage capable of
-600mA /800mA current suited for big MOSFET.
SD7530 has a built-in soft-start circuit to avoid the over voltage
output under light load start, reduce MOSFET’s voltage stress,
and improve circuit’s reliability.
SD7530 has a built-in output short-circuit protection circuit, in this
way the current of the system is considerably reduced to avoid the APPLICATIONS
damage to IC.
SD7530 includes VCC under voltage lockout, VCC over voltage
* LED Daylight lamp
protection, and over temperature protection, etc.
FEATURES
* Transition Mode (TM) operation
* High-performance analog multiplier
* Built-in restart timer
* Integrate digital LEB
* Low start-up current (5μA)
* Audio noise free
* Built-in soft start circuit
* Very low power dissipation of output short-circuit protection
(SCP)
* VCC under vltage lockout with hysteresis (UVLO)
* VCC over-voltage protection (VCCOVP)
* Over temperature protection (OTP)
ORDERING INFORMATION
Part No.
SD7530S
SD7530STR
Package
SOP-8-225-1.27
SOP-8-225-1.27
Marking
SD7530S
SD7530S
Material
Halogen free
Halogen free
Packing
Tube
Tape&Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1
2013.07.24
Page 1 of 10
1 page  
Silan
Microelectronics
SD7530_Datasheet
FUNCTION DESCRIPTION
SD7530 is a high power factor flyback PWM controller special for LED lighting applications. It operates in
transition mode, it reduces the switch turn-on loss, improves the conversion efficiency and provides very
good power factor correction.
VCC UVLO and VCC OVP
Peripheral/internal circuit at pin Vcc of SD7530 is shown in figure 1. At the beginning of the power on,
capacitor C1 is charged by VIN through start resistor R1, and VCC increases slowly. As VCC is up to 17.5V,
IC starts to work and output driving pulse. Output voltage should be established in a period during which
VCC discharges and diode D2 is reverse biased, and IC is fully powered by start capacitor C1. When output
voltage increases to a certain value, diode D2 is forward conduction by auxiliary winding L3’s voltage, and
then VCC increases rapidly to the desired value. Fig. 2 shows the voltage waveform of VCC during start.
IC enters under voltage status as VCC is lower than 9.0V after start.
Moreover, the startup current of SD7530 is very low (less than 5uA), so large startup resistance R1 is
recommended for low power dissipation.
If Vcc exceeds the internal reference 34V, IC enters over voltage protection (OVP), and turns off the PWM
until next restart.
VIN
Vcc built-up
VCC
UVLO
VCC
OVP
Vcc 8
17.5V/9.0V
Hysteresis
comparator
R1
C1
D2
L3
C1 is charged
C1 discharges till Vcc
built-up
MOS drive
signal
Fig.1 Internal /peripheral circuit at pin VCC
Fig. 2 the voltage waveform of VCC during start
Error amplifier
Error amplifier of SD7530 and peripheral circuit are shown in fig.3. Error amplifier compares the voltage of
pin INV which is fed back from output by optp-coupler with reference voltage (2.5V), amplifies the
difference and outputs Vcomp. Generally, the bandwidth of PFC loop is less than 20Hz for better power
factor correction, so compensation capacitor or resistor is connected between output (COMP) and inverting
input (INV) of error amplifier in applications.
Vcc
Vcomp
2.5V
Error amplifier
INV 1
COMP
2
C2
Rfa
Rfb
Fig.3 Error amplifier and peripheral circuit
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.1
2013.07.24
Page 5 of 10
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SD7530.PDF ] | |
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