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PDF BP2519 Data sheet ( Hoja de datos )

Número de pieza BP2519
Descripción PSR Isolated CCCV Driver IC
Fabricantes BPS 
Logotipo BPS Logotipo



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晶丰明源半导体
BP2519
PSR Isolated CCCV Driver IC
Description
BP2519 is non-isolated CCCV driver IC. The device
is suitable for 85Vac~265Vac universal input offline
LED lighting. The BP2519 can perform in high
accurate CCCV without external compensation
capacitor, benefit to save the BOM size and cost.
The BP2519 supports multiple control mode of PWM
and PFM, which contribute to very low standby power,
high efficiency and minimum no load noise.
The BP2519 offers rich protection functions to
improve the system reliability, including cycle by
cycle peak current control, load open/short protection,
VCC under/over voltage protection, and over
temperature protection.
Typical Application
Features
Non-Isolated CCCV control
PWM/PFM multiple mode control
Standby power <200mW
±5% Output Accuracy
Internal soft startup
Load open protection
Load short protection
VCC under voltage protection
Over temperature protection
Cycle by cycle peak current control
Available in SOT23-5L package
Applications
Chargers
Standby/auxiliary power
LED driving model
AC IN
VCC GATE
BP2519
FB CS
GND
Lm
DC OUT
Fig1 Typical application circuit for BP2519
BP2519_EN_DS_Rev.1.0
www.bpsemi.com
BPS Confidential Customer Use Only
1

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BP2519 pdf
晶丰明源半导体
Internal Block Diagram
VCC
7.6V 15.2V
+
-
26.5V 28V
UVLO
Startup
CCC Mode
DEMG
BP2519
PSR Isolated CCCV Driver IC
VCC Clamp
VCC OVP
GATE
CCCV control
&
Logic control
CS offset
protection
Softstart
Load
open/short
protection
PWM+PFM
CV Mode
3V
EA
+
Current
Sense
-
LEB
CS
Vcs_ref
FB GND
Fig3 BP2519 Internal Block Diagram
Application Information
BP2519 is non-isolated CCCV driver IC. BP2519 can
work in multiple control mode of PFM and PWM
providing high accurate constant current control and
constant voltage control. There is very few external
components required in bill of material. BP2519
provides the popular solutions for standby power,
LED drivers and any CCCV request.
Start Up
After system powered on, the capacitor on VCC pin is
charged up by the startup resistor. When the VCC pin
voltage reaches the turn on threshold, the internal
circuits start working. After the output voltage is built
up, the VCC power is supplied by the output voltage
through a diode.
in every restart cycle.
Constant Current Control
The peak current of primary side inductor is sensed
cycle by cycle. The CS pin monitors the peak level
and inputs into the internal comparator with converted
voltage of the switching status; once the voltage above
the reference threshold, the switching would be
stopped.
The peak current for full load is defined as:
I P_PK
600 (mA)
RCS
Soft start is also implemented during startup within
1ms timeslot, and activated to increase the primary
side peak current in steps. The soft start is available
The peak detection has a fixed 350ns lead edge
blanking time on CS.
The device operates in critical conduction mode .The
BP2519_EN_DS_Rev.1.0
www.bpsemi.com
BPS Confidential Customer Use Only
5

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