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PDF L2263 Data sheet ( Hoja de datos )
| Número de pieza | L2263 | |
| Descripción | Current Mode PWM Controller | |
| Fabricantes | LIZE | |
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Hay una vista previa y un enlace de descarga de L2263 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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Shenzhen LIZE Electronic Technology Co., Ltd
SPECIFICATION
L2263
Current Mode PWM Controller
VERSION 1.2
reserves the right to change this documentation without prior notice
1 page  
Shenzhen LIZE Electronic Technology Co., Ltd
L2263
Current Mode PWM Controller
Ordering Information
Part number
L2263TP
L2263SP
L2263DP
Package
SOT23-6
SOP-8
DIP-8
version number
Pin Description
Symbol
Type
GATE
O
VDD
P
SENSE
I
RI I
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.
Internal oscillator frequency setting 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 Page 5 of 16
5 Page 
Shenzhen LIZE Electronic Technology Co., Ltd
L2263
Current Mode PWM Controller
thus cannot turn off the external MOSFET
during the blanking period. PWM duty cycle is
determined by the current sense input voltage
and the FB input voltage.
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
L2263 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 Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet L2263.PDF ] | |
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