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PDF L2269 Data sheet ( Hoja de datos )
| Número de pieza | L2269 | |
| Descripción | Current Mode PWM Controller | |
| Fabricantes | LIZE | |
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Hay una vista previa y un enlace de descarga de L2269 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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Shenzhen LIZE Electronic Technology Co., Ltd
SPECIFICATION
L2269
Current Mode PWM Controller
VERSION 1.0
reserves the right to change this documentation without prior notice
1 page  
Shenzhen LIZE Electronic Technology Co., Ltd
L2269
Current Mode PWM Controller Frequency Shuffling
Block Diagram
Absolute Maximum Rating
Parameter
VDD/VIN supply voltage
VDD zener clamp voltage
VDD clamp continuous current
VFB input voltage
VSENSE input voltage to SENSE pin
VRT input voltage to RT pin
VRI input voltage to RI pin
Operating ambient temperature
Min/Max operating junction temperature
Value
30
VDD clamp +0.1
10
-0.3 to 7
-0.3 to 7
-0.3 to 7
-0.3 to 7
-20 to 85
-55 to 150
Unit
V
KΩ
mA
V
V
V
V
℃
℃
reserves the right to change this documentation without prior notice Page 5 of 13
5 Page 
Shenzhen LIZE Electronic Technology Co., Ltd
L2269
Current Mode PWM Controller Frequency Shuffling
MOSFET when the sensed input voltage is lower than VTH_OTP.
Gate Drive
L2269 Gate is connected to the Gate of an external MOSFET 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.
Good tradeoff is achieved through the built-in totem pole gate drive 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 system reliability is achieved with L2269’s rich protection features including Cycle-by-
Cycle current limiting (OCP), Over Load Protection (OLP), over temperature protection (OTP), on
chip VDD over voltage protection (OVP, optional) and under voltage lockout (UVLO).
The OCP threshold value is self adjusted lower at higher current into VIN pin. This OCP threshold
slope adjustment helps to compensate the increased output power limit at higher AC voltage caused
by inherent Over-Current sensing and control delay. A constant output power limit is achieved with
recommended OCP compensation scheme on L2269.At output overload condition, FB voltage is
biased higher. When FB input exceeds power limit threshold value for more than 80mS, control
circuit reacts to turnoff the power MOSFET.
Similarly, control circuit shutdowns the power MOSFET when an Over Temperature condition is
detected.L2269 resumes the operation when temperature drops below the hysteresis value.VDD is
supplied with transformer auxiliary winding output. It is clamped when VDD is higher than 35V.
MOSFET is shut down when VDD drops below UVLO(enter) limit and device enters power on
startup sequence thereafter
reserves the right to change this documentation without prior notice Page 11 of 13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet L2269.PDF ] | |
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