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SF1530 데이터시트 PDF
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PDF 형식의 SF1530 자료 제공
| 부품번호 | SF1530 기능 |
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| 기능 | High Performance Current Mode PWM Controller | ||
| 제조업체 | SiFirst | ||
| 로고 |  |
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전체 11 페이지수
SF1530
High Performance Current Mode PWM Controller
FEATURES
◆ Proprietary “Zero OCP/OPP Recovery Gap”
Control
◆ Built-in Soft Start Function
◆ All Pins Floating Protection
◆ Very Low Startup Current
◆ High Voltage CMOS Process with Excellent
ESD Protection
◆ Frequency Reduction and Burst Mode Control
for Energy Saving
◆ Current Mode Control
◆ Built-in Frequency Shuffling
◆ Programmable Switching Frequency
◆ Built-in Synchronous Slope Compensation
◆ Cycle-by-Cycle Current Limiting
◆ Built-in Leading Edge Blanking (LEB)
◆ Constant Power Limiting
◆ Audio Noise Free Operation
◆ VDD OVP & Clamp
◆ VDD Under Voltage Lockout (UVLO)
APPLICATIONS
Offline AC/DC Flyback Converter for
◆ AC/DC Adaptors
◆ Open-frame SMPS
◆ Set-Top Box Power Supplies
◆ ATX Standby Power
GENERAL DESCRIPTION
SF1530 is a high performance, low cost, highly
integrated current mode PWM controller for offline
flyback converter applications.
PWM switching frequency with shuffling is externally
programmable, which can reduce conduction EMI
emission of a power supply. When the output power
demands decrease, the IC automatically decreases
switching frequency for high power conversion
efficiency. When the current set-point falls below a
given value, e.g. the output power demand
diminishes, the IC enters into burst mode and
provides excellent efficiency without audio noise.
The IC can achieve “Zero OCP/OPP Recovery Gap”
using SiFirst’s proprietary control algorithm.
Meanwhile, the OCP/OPP variation versus universal
line input is compensated.
The IC has built-in synchronized slope compensation
to prevent sub-harmonic oscillation at high PWM duty
output. The IC also has built-in soft start function to
soften the stress on the MOSFET during power on
period.
SF1530 integrates functions and protections of Under
Voltage Lockout (UVLO), VCC Over Voltage
Protection (OVP), Cycle-by-cycle Current Limiting
(OCP), All Pins Floating Protection, Over Load
Protection (OLP), RT Pin Short-to-GND Protection,
Gate Clamping, VCC Clamping, Leading Edge
Blanking (LEB).
SF1530 is available in SOT23-6, SOP-8 and DIP-8
packages.
TYPICAL APPLICATION
AC IN
65
GATE VDD
4
CS
SF1530
GND FB RT
1 23
DC Out
TL431
©SiFirst Technology
www.sifirsttech.com
-1-
SF1530_DS_V1.0
 
Storage Temperature Range
Lead Temperature (Soldering, 10sec.)
ESD Capability, HBM (Human Body Model)
ESD Capability, MM (Machine Model)
Recommended Operation Conditions (Note 2)
Parameter
Supply Voltage, VDD
Operating Frequency
Operating Ambient Temperature
-65 to 150
260
3
250
SF1530
oC
oC
kV
V
Value
11 to 25
50 to 130
-40 to 85
Unit
V
kHz
oC
ELECTRICAL CHARACTERISTICS
(TA = 25OC, RT=100K ohm, VDD=18V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Supply Voltage Section (VDD Pin)
UVLO(ON)
VDD Under Voltage
Lockout Exit (Startup)
UVLO(OFF)
VDD Under Voltage
Lockout Enter
I_Startup
VDD Start up Current VDD =12.5V, Measure
current into VDD
I_VDD_Op
VDD_OVP
Operation Current
VDD Over Voltage
VFB=3V,CL=1nF
Protection trigger
VDD_Clamp
VDD Zener Clamp
Voltage
I(VDD ) = 15 mA
T_Softstart
Soft Start Time
Feedback Input Section(FB Pin)
VFB_Open
FB Open Voltage
IFB_Short
FB short circuit
current
Short FB pin to GND,
measure current
AVCS
VFB_min_duty
PWM Input Gain
ΔVFB /ΔVcs
FB under voltage gate
clock is off.
VTH_PL
Power Limiting FB
Threshold Voltage
TD_PL
Power limiting
Debounce Time
Note 3
ZFB_IN
Input Impedance
Current Sense Input Section (CS Pin)
Vth_OC_min
Internal current
Zero duty cycle
limiting threshold
T_blanking
SENSE Input Leading
Edge Blanking Time
TD_OC
Over Current
CL=1nF at GATE,
Detection and Control
Delay
Oscillator Section (RT Pin)
FOSC
Normal Oscillation
Frequency
RT_range
Operating RT Range
V_RT_open
RT open voltage
∆F(shuffle)/Fosc Frequency shuffling Note 4
∆f_Temp
range
Frequency
-20oC to 100 oC (Note 4)
Temperature Stability
∆f_VDD
Frequency Voltage
VDD = 12-25V,
Min Typ Max Unit
13 14 15 V
8 9 10 V
5 20 uA
2.5 3.5 mA
25 27.5 30 V
33 V
3 mSec
5.3 V
1.1 mA
2.0 V/V
1.0 V
3.7 V
43 mSec
5 Kohm
0.70 0.75 0.80 V
250 nSec
70 nSec
60 65 70 KHZ
50 100 150 Kohm
2.0 V
-4 4 %
5%
5%
©SiFirst Technology
www.sifirsttech.com
-4-
SF1530_DS_V1.0
4페이지 
an internal leading edge blanking circuit is built in.
During this blanking period (350ns, typical), the
PWM comparator is disabled and cannot switch off
the gate driver. Thus, external RC filter with a small
time constant is enough for current sensing.
◆ Frequency Reduction for Green Mode
Operation
When the loading is light, the IC will automatically
reduce the PWM switching frequency to achieve
high efficiency. In the whole frequency reduction
process, there is no audio noise generated.
PWM Frequency
65kHz
(RT=100kΩ)
SF1530
◆ Auto Recovery Mode Protection
As shown in Fig.5, once a fault condition is
detected, switching will stop. This will cause VDD to
fall because no power is delivered form the
auxiliary winding. When VDD falls to UVLO(off)
(typical 9V), the protection is reset and the
operating current reduces to the startup current,
which causes VDD to rise, as shown in Fig.4.
However, if the fault still exists, the system will
experience the above mentioned process. If the
fault has gone, the system resumes normal
operation. In this manner, the auto restart can
alternatively enable and disable the switching until
the fault condition is disappeared.
22kHz
0
Burst
mode
Frequency
Reduction mode
Fig.3
VFB
Normal
mode
◆ Burst Mode Control
When the loading is very small, the system enters
into burst mode. When VFB drops below Vskip,
SF1530 will stop switching and output voltage
starts to drop, which causes the VFB to rise. Once
VFB rises above Vskip, switching resumes. Burst
mode control alternately enables and disables
switching, thereby reducing switching loss in
standby mode.
Fig.4
Fig.5
◆ VDD OVP(Over Voltage Protection)
VDD OVP (Over Voltage Protection) is
implemented in SF1530 and it is a protection of
auto-recovery mode.
◆ Over Load Protection (OLP)
When over load occurs, a fault is detected. If this
fault is present for more than 43ms (typical), the
protection will be triggered, the IC will experience
an auto-recovery mode protection as mentioned
above. The 43mS delay time is to prevent the false
trigger from the power-on and turn-off transient
◆ All Pins Floating Protection and RT Pin
Short-to-GND Protection
In SF1530, if pin floating situation or RT pin short-
to-GND occurs, the protection is triggered
immediately and the system will experience the
process of auto-recovery mode protection.
◆ Soft Gate Drive
SF1530 has a fast totem-pole gate driver with
300mA capability. Cross conduction has been
avoided to minimize heat dissipation, increase
efficiency, and enhance reliability. An internal 17V
clamp is added for MOSFET gate protection at
higher than expected VDD input. A soft driving
waveform is implemented to minimize EMI.
©SiFirst Technology
www.sifirsttech.com
-7-
SF1530_DS_V1.0
7페이지 | |||
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