900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






SiFirst

SF1539W Datasheet Preview

SF1539W Datasheet

PWM Power Switch

No Preview Available !

SF1539W
η -BalanceTM PWM Power Switch Fixed 50KHz Fsw
FEATURES
Built-in 700V Power MOSFET
Proprietary η -BalanceTM Control to Boost
Light Load Efficiency
Proprietary Zero OCP/OPP Recovery Gap
Control
Fixed 50KHz Switching Frequency
Built-in Soft Start Function
Very Low Startup Current
Frequency Reduction and Burst Mode Control
for Energy Saving
Current Mode Control
Built-in Frequency Shuffling
Built-in Synchronous Slope Compensation
Cycle-by-Cycle Current Limiting
Built-in Leading Edge Blanking (LEB)
Constant Power Limiting
Pins Floating Protection
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
SF1539W is a high performance, high efficiency,
highly integrated current mode PWM power switch for
offline flyback converter applications.
In SF1539W, PWM switching frequency with shuffling
is fixed to 50KHz and is trimmed to tight range. When
the output power demands decrease, the IC
decreases switching frequency based on the
proprietary η -BalanceTM control to boost power
conversion efficiency at the light load. When output
power falls below a given value, the IC enters into
burst mode and provides excellent efficiency without
audio noise.
The IC can achieve Zero OCP/OPP Recovery Gap
using SiFirsts 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.
SF1539W integrates functions and protections of
Under Voltage Lockout (UVLO), VCC Over Voltage
Protection (OVP), Cycle-by-cycle Current Limiting
(OCP), Pins Floating Protection, Over Load
Protection (OLP), VCC Clamping, Leading Edge
Blanking (LEB), etc.
SF1539W is available in DIP8 packages.
TYPICAL APPLICATION
AC IN
EMI
Filter
DC Out
SF1539W
1 NC GND 8
2 VDD GND 7
3 FB Drain 6
4 CS Drain 5
©SiFirst Technology
-1-
TL431
Confidential
SiFirst_DS_1539W_V1.0




SiFirst

SF1539W Datasheet Preview

SF1539W Datasheet

PWM Power Switch

No Preview Available !

Pin Configuration
NC
VDD
FB
CS
18
DIP8
27
36
45
GND
GND
Drain
Drain
SF1539W
Ordering Information
Part Number
Top Mark
SF1539WDP
SF1539WDP
Package
DIP8
RoHs
Tape & Reel
Output Power Table(1)
Part Number
230VAC ± 15%(2)
Adapter(3)
Open Frame(4)
SF1539WDP
18W
26W
85-265VAC
Adapter(3)
Open Frame(4)
13W
16W
Note 1. The Max. output power is limited by junction temperature
Note 2. 230VAC or 100/115VAC with doublers
Note 3. Typical continuous power in a non-ventilated enclosed adapter with sufficient drain pattern as a heat
sink at 50 oC ambient.
Note 4. Max. practical continuous power in a open-frame design with sufficient drain pattern as a heat sink at
50 oC ambient.
Marking Information
S F 1539WD P YWW: Year&Week code
Y WW
©SiFirst Technology
- 2 - Confidential
SiFirst_DS_1539W_V1.0


Part Number SF1539W
Description PWM Power Switch
Maker SiFirst
PDF Download

SF1539W Datasheet PDF






Similar Datasheet

1 SF1539 PWM Power Switch
SiFirst
2 SF1539HT PWM Power Switch
SiFirst
3 SF1539W PWM Power Switch
SiFirst





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy