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PDF SF1530 Data sheet ( Hoja de datos )
| Número de pieza | SF1530 | |
| Descripción | High Performance Current Mode PWM Controller | |
| Fabricantes | SiFirst | |
| Logotipo |  |
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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
1 page  
SF1530
Stability
Duty_max
Maximum Duty cycle
F_BM
Burst Mode Base
Frequency
Gate Drive Output (GATE Pin)
VOL
Output Low Level
VOH
Output High Level
VG_Clamp
Output Clamp Voltage
Level
T_r Output Rising Time
T_f Output Falling Time
Io = 20 mA (sink)
Io = 20 mA (source)
VDD=24V
CL = 1nF
CL = 1nF
75 80 85 %
22 KHZ
1
7.5
17.5
200
60
V
V
V
nSec
nSec
Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other
conditions beyond those indicated in the operational sections of the specifications is not implied.
Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Note 2. The device is not guaranteed to function outside its operating conditions.
Note 3. The OLP debounce time is proportional to the period of switching cycle.
Note 4. Guaranteed by design.
CHARACTERIZATION PLOTS
©SiFirst Technology
www.sifirsttech.com
-5-
SF1530_DS_V1.0
5 Page 
SF1530
IMPORTANT NOTICE
SiFirst Technology Nanhai, Ltd (SiFirst) reserves the right to make corrections, modifications, enhancements,
improvements and other changes to its products and services at any time and to discontinue any product or
service without notice. Customers should obtain the latest relevant information before placing orders and should
verify that such information is current and complete.
SiFirst warrants performance of its hardware products to the specifications applicable at the time of sale in
accordance with SiFirst’s standard warranty. Testing and other quality control techniques are used to the extent
SiFirst deems necessary to support this warranty. Except where mandated by government requirements,
testing of all parameters of each product is not necessarily performed.
SiFirst assumes no liability for application assistance or customer product design. Customers are responsible
for their products and applications using SiFirst’s components. To minimize the risks associated with customer
products and applications, customers should provide adequate design and operating safeguards.
Reproduction of SiFirst’s information in SiFirst’s data books or data sheets is permissible only if reproduction is
without alteration and is accompanied by all associated warranties, conditions, limitations, and notices.
Reproduction of this information with alteration is an unfair and deceptive business practice. SiFirst is not
responsible or liable for such altered documentation. Information of third parties may be subject to additional
restrictions.
Resale of SiFirst’s products or services with statements different from or beyond the parameters stated by
SiFirst for that product or service voids all express and any implied warranties for the associated SiFirst’s
product or service and is an unfair and deceptive business practice. SiFirst is not responsible or liable for any
such statements.
SiFirst’s products are neither designed nor intended for use in military applications. SiFirst will not be held liable
for any damages or claims resulting from the use of its products in military applications.
SiFirst’s products are not designed to be used as components in devices intended to support or sustain human
life. SiFirst will not be held liable for any damages or claims resulting from the use of its products in medical
applications.
For the latest updates, please visit our website: www.sifirsttech.com
©SiFirst Technology
www.sifirsttech.com
- 11 -
SF1530_DS_V1.0
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet SF1530.PDF ] | |
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