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SF5565M Datasheet Preview

SF5565M Datasheet

Current Mode PWM Controller

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SF5565M
η-BalanceTM Current Mode PWM Controller with Brownout Protection
FEATURES
Less than 100mW Standby Power
Brownout Protection (BOP)
Proprietary η-BalanceTM Control to Boost
Light Load Efficiency
Proprietary “Zero OCP/OPP Recovery Gap”
Control
Proprietary “Audio Noise Free OCP
Compensation”
Fixed 65KHz Switching Frequency
Built-in Frequency Shuffling
Built-in Soft Start Function
Frequency Reduction and Burst Mode Control
for Energy Saving
Built-in Synchronous Slope Compensation
Cycle-by-Cycle Current Limiting
Built-in Leading Edge Blanking (LEB)
Current Mode Control
Pin Floating Protection
Latch Plug-off Protection
VDD UVLO, OVP & Clamp
APPLICATIONS
Offline AC/DC Flyback Converter for
AC/DC Adaptors
Open-frame SMPS
TYPICAL APPLICATION
GENERAL DESCRIPTION
SF5565M is a high performance, high efficiency,
highly integrated current mode PWM controller for
offline flyback converter applications.
In SF5565M, PWM switching frequency with shuffling
is fixed to 65KHz 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 can achieve less than 100mW no
load power.
The IC can achieve “Zero OCP/OPP Recovery Gap
using SiFirst’s proprietary control algorithm.
SF5565M also has built in proprietary “Audio Noise
Free OCP Compensation”, which can achieve
constant power limiting and can achieve audio noise
operation at heavy loading when line input is around
90VAC.
SF5565M integrates functions and protections of
Brownout Protection (BOP), Under Voltage Lockout
(UVLO), VDD Over Voltage Protection (OVP), Cycle-
by-cycle Current Limiting (OCP), Over Load
Protection (OLP), Gate Clamping, VDD Clamping,
Leading Edge Blanking (LEB), Soft Start, Pins
Floating Protection, etc.
In SF5565M, VDD OVP is latch plug-off protection,
the other protections are auto-recovery mode.
SF5565M is available in SOT23-6 package.
AC IN
65
GATE VDD
4
CS
SF5565M
GND FB BO
1 23
DC Out
TL431
©SiFirst Technology
- 1 - Confidential
SiFirst_DS_5565M_V1.0




SiFirst

SF5565M Datasheet Preview

SF5565M Datasheet

Current Mode PWM Controller

No Preview Available !

Pin Configuration
GND
FB
BO
16
SOT23-6
25
34
GATE
VDD
CS
SF5565M
Ordering Information
Part Number
Top Mark
SF5565MLGT
.65MYW
Marking Information
Package
SOT26
Green
Tape & Reel
Yes
65M YW
Dot: Pin1 Mark
65M:Part number SF5565M
YW: Year&Week Code
Pin Description
Pin Num
1
2
3
4
5
6
Pin Name I/O Description
GND
P Ground
FB I Voltage feedback pin. The loop regulation is achieved by connecting a
photo-coupler to this pin. PWM duty cycle is determined by this pin voltage
and the current sense signal at Pin 4.
BO I Brownout protection detection pin. Connect a resistor divider between this
pin and bulk capacitor voltage to set the brownout level. If the voltage is
below threshold voltage, the PWM output will be disabled.
CS I Current sense input pin.
VDD
P IC power supply pin.
GATE O Totem-pole gate driver output to drive the external MOSFET.
©SiFirst Technology
- 2 - Confidential
SiFirst_DS_5565M_V1.0


Part Number SF5565M
Description Current Mode PWM Controller
Maker SiFirst
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SF5565M Datasheet PDF






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