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L2273 Schematic ( PDF Datasheet ) - LIZE

Teilenummer L2273
Beschreibung Current Mode PWM Controller
Hersteller LIZE
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Gesamt 15 Seiten
L2273 Datasheet, Funktion
Shenzhen LIZE Electronic Technology Co., Ltd
Current Mode PWM Controller
L2273
SPECIFICATION
L2273
Current Mode PWM Controller
VERSION 1.0
reserves the right to change this documentation without prior notice






L2273 Datasheet, Funktion
Shenzhen LIZE Electronic Technology Co., Ltd
Current Mode PWM Controller
L2273
Ordering Information
Part number
L2273TP
L2273SP
L2273DP
Package
SOT23-6
SOP-8
DIP-8
version number
Pin Description
Symbol
GATE
VDD
Type
O
P
SENSE
I
VS Z
FB I
Gnd P
Description
Totem-pole gate diver output for the power MOSFET
Chip DC power supply pin
Current sense intput pin. Connected to MOSFET current resistor
node.
Active Start-Up Pin
Feedback input pin. The PWM duty cycle is determined by voltage
level into this pin and SENSE pin input.
Ground.
reserves the right to change this documentation without prior notice

6 Page









L2273 pdf, datenblatt
Shenzhen LIZE Electronic Technology Co., Ltd
Current Mode PWM Controller
L2273
Internal Synchronized
Slope Compensation
Built-in slope compensation circuit adds
voltage ramp onto the current sense input
voltage for PWM generation. This greatly
improves the close loop stability at CCM and
prevents the sub-harmonic oscillation and thus
reduces the output ripple voltage.
Gate Drive
L2273 Gate is connected to an external
MOSFET gate for power switch control. Too
weak the gate drive strength results in higher
conduction and switch loss of MOSFET while
too strong gate drive output compromises the
EMI.A good tradeoff is achieved through the
built-in totem pole gate design with right
output strength and dead time control. The low
idle loss and good EMI system design is easier
to achieve with this dedicated control scheme.
An internal 18V clamp is added for MOSFET
gate protection at higher than expected VDD
input.
Protection Controls
Good power supply system reliability is
achieved with its rich protection features
including Cycle-by- Cycle current limiting
(OCP), Over Load Protection (OLP) and over
voltage clamp, Under Voltage Lockout on
VDD (UVLO). With On-Bright Proprietary
technology, the OCP threshold tracks PWM
Duty cycles and is line voltage compensated to
achieve constant output power limit over the
universal input voltage range with
recommended reference design. At overload
condition when FB input voltage exceeds
power limit threshold value for more than
TD_PL, control circuit reacts to shut down the
output power MOSFET. Device restarts when
VDD voltage drops below UVLO limit. VDD
is supplied by transformer auxiliary winding
output. It is clamped when VDD is higher than
threshold value. The power MOSFET is shut
down when VDD drops below UVLO limit and
deviceenters power on start-up sequence
thereafter.
reserves the right to change this documentation without prior notice

12 Page





SeitenGesamt 15 Seiten
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