SF1560
Highly Integrated Current Mode PWM Controller
TURES
◆
Latch Plug-off Protection with External
Triggering
◆
Built-in Soft Start Function
◆
Very Low Startup Current
◆
Frequency Reduction and Burst Mode Control
for Energy Saving
◆
Built-in Frequency Shuffling
◆
Programmable Switching Frequency
◆
Built-in Synchronous Slope Compensation
◆
Cycle-by-Cycle Current Limiting
◆
All Pins Floating Protection
◆
High Voltage CMOS Process with Excellent
ESD Protection
◆
Current Mode Control
◆
Built-in Leading Edge Blanking (LEB)
◆
Constant Power Limiting
◆
Audio Noise Free Operation
◆
VDD OVP & Clamp
◆
VDD Under Voltage Lockout (UVLO)
with Latch
GENERAL DESCRIPTION
SF1560 is a high performance, highly integrated
current mode PWM controller for medium to large
offline flyback converter applications.
In SF1560, the PWM switching is internally trimmed
to tight range. To improve EMI performance, the IC
integrates frequency shuffling function to reduce
conduction EMI emission of a power supply. The IC
also integrates Constant Power Limiting block to
achieve constant output power limit from 90VAC to
264VAC.
Under light load conditions, a green mode function
can continuously decrease the switching frequency.
Under zero-load conditions, the power supply enters
into burst mode and provides excellent efficiency
without audio noise generated. This green mode
function enables power supplies to meet international
power conservation requirements.
SF1560 integrates functions and protections of Under
Voltage Lockout (UVLO), VDD Over Voltage
Protection (OVP), Soft Start, External Programmable
Over Temperature Protection (OTP), Cycle-by-cycle
Current Limiting (OCP), Over Load Protection (OLP),
All Pins Floating Protection, RI Pin Short-to-GND
Protection, GATE Clamping, VDD Clamping, Leading
Edge Blanking (LEB).
In SF1560, the OTP and VDD OVP is
Latch Plug-off
Protection.
The other protection functions are auto-
recovery mode protection.
SF1560 is available in SOP-8 and DIP-8 packages.
APPLICATIONS
Offline AC/DC Flyback Converter for
◆
AC/DC Power Adaptors
◆
Open-frame SMPS
◆
Print Power, Scanners, and Motor Drivers
TYPICAL APPLICATION
AC IN
EMI
Filter
DC Out
SF1560
1
2
3
4
GND
GATE
8
7
6
NTC
FB
VDD
VIN
CS
TL431
RI
RT
5
©SiFirst Technology
-1-
SiFirst_DS_1560_brief
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