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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
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Silan
Microelectronics
SD7530_Datasheet
BLOCK DIAGRAM
5 ZCD
CLAMP
1.1V/0.25V
VCC
UVLO
VCC 8
17.5V/9.0V VCC
OVP
4 CS
LEB
COMPA
LOGIC
CONTRL
GATE
DRIVE
OUT 7
MULTIPLIER
3 MULT
GND
6
SOFT
START
COMP
2
OTP
SCP
ERROR
AMP
VREF
INV 1
ABSOLUTE MAXIMUM RATINGS
Characteristics
Supply voltage (ICC<20mA)
Peak drive output current
Voltage on analog input and output pins
Maximum current of zero current detector
Power dissipation (ambient temperature:
50°C)
Operating temperature range
Storage temperature range
Junction temperature
Thermal resistance from chip surface to
the ambient
Symbol
VCC
IOH/IOL
-
-
Pdiss
Tamb
Tstg
Tj
Rth(j-a)
Rating
40
-600/800
-0.3 ~ 8
±10
0.65
-40~+120
-55~+150
+150
150
Unit
V
mA
V
mA
W
°C
°C
°C
°C/W
°C/W
ELECTRICAL CHARACTERISTICS(Unless otherwise stated, VCC=22VCO=1nF-25°C<Tamb<125°C)
Characteristics
Power supply
Operating voltage range
Turn-on threshold
Turn-off threshold
Hysteresis voltage
Symbol
Test condition
VCC
VCCon
VCCoff
VCChys
After start-up
*
*
Min. Typ. Max.
Unit
10.5 --
32
16.5 17.5 18.5
8.0 9.0 10.0
-- 8.5 --
V
V
V
V
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SD7530_Datasheet
Characteristics
Symbol
Test condition
Clamp voltage
VCC OVP
Supply current
Vz
VCCovp
ICC=20mA
Start current
Quiescent current
Operating current
Multiplier
IST Before start-up, VCC=15V
IQ No switch
ICC f=70kHz
Input bias current
Input voltage range
Gain **
Maximum output slope
Error amplifier
IMULT
VMULT
K
ΔVCS
ΔVMULT
VMULT = 0 ~ 4V
Linear operation range
VMULT=1V, VCOMP=4V
VMULT=0 ~ 1V
VCOMP=upper clamp voltage
Voltage feedback input
threshold
VREF
Linear regulation
-
Input bias current
IINV
Voltage gain
GV
Gain bandwidth product
GB
Source current
ICOMP
Sink current
ICOMP
Upper clamp voltage
VCOMP
Lower clamp voltage
VCOMP
Current sense comparator
Tamb=25°C
10.5V< VCC <32V *
VCC =10.5V~ 32V
VINV = 0 ~ 3V
Open loop
VCOMP=4V, VINV=2.4V
VCOMP=4V, VINV=2.6V
Isource=0.5mA
Isink=0.5mA *
Input bias current
Delay to output
Current sense clamp
Current sense offset
Zero current detector
ICS
td(H-L)
VCS
Voffset
VCS=0V
VCOMP=Upper clamp
VMULT=1.5V
VMULT=0V
VMULT=2.5V
Input bias current
Detect threshold
Detect hysteresis
IZCD
Vth(det)
HY(det)
VZCD=1 ~ 4.5V
VZCD rise ***
VZCD fall ***
***
Upper clamp voltage
Lower clamp voltage
Source current capability
Sink current capability
Restart timer
VZCD
VZCD
Isrc
Isnk
IZCD=2.5mA
IZCD=-2.5mA
Restart timer period
td(rst)
Min.
--
32
Typ.
40
34
Max.
--
36
Unit
V
V
-- 5 10 μA
-- 4 6 mA
-- 5 7 mA
-- -- -1
0~3 --
--
0.32 0.38 0.44
1.0 1.1
--
μA
V
1/V
V/V
2.45 2.5 2.55
2.44 -- 2.56
-- 2 5
-- -- -1
60 80
--
-- 1 --
-2 -3.5 -5
4 5.5 7
5.0 6.0 6.5
2.0 2.25 2.4
V
mV
μA
dB
MHz
mA
mA
V
V
-- -- -1
-- 200 400
1.0 1.08 1.16
-- 25 --
-- 5 --
μA
ns
V
mV
-- 2 --
-- 1.1 --
-- 0.25 --
-- 0.85 --
6.3 6.8 7.3
-0.3 0 0.3
-2.5 --
--
2.5 --
--
μA
V
V
V
V
V
mA
mA
31 38 45
μs
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SD7530_Datasheet
Characteristics
Symbol
Over Temperature Protection
Test condition
OTP
Temperature hysteresis
Gate driver
TOTP
THYS
Output low voltage
VOL Isink=100mA
Output high voltage
VOH
Isource=5mA
Peak drive source current Isrcpk
Peak drive sink current
Isnkpk
Voltage rise time
tr
Voltage fall time
tf
Output clamp voltage
Vclamp Isource=5mA ; VCC=32V
* All the parameters are in tracking
** The multiplier output is given by: VCS = K × VMULT × (VCOMP 2.5)
*** Parameters guaranteed by design.
PIN CONFIGURATIONS
Min. Typ. Max.
-- 135 --
-- 15 --
-- 0.6 1.2
-- 15 --
-0.6 --
--
0.8 --
--
-- 70 110
-- 40 70
12 15 18
Unit
°C
°C
V
V
A
A
ns
ns
V
INV 1
COMP 2
MULT 3
CS 4
8 VCC
7 GD
6 GND
5 ZCD
PIN DESCRIPTIONS
Pin No.
Pin Name
1 INV
2 COMP
3 MULT
4 CS
5 ZCD
6 GND
7 GD
8 VCC
I/O Description
Inverting input of the error amplifier. The pin doubles as an ON/OFF
I
control input.
Output of the error amplifier. A compensation network is placed
I/O
between this pin and INV.
I Main input to the multiplier.
Input to the PWM comparator. The current flowing in the MOSFET is
I
sensed through a resistor, the resulting voltage is applied to this pin.
I Input to the zero current detector.
I/O Ground.
O Gate driver output.
I/O Supply voltage.
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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
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REV:1.1
2013.07.24
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