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BP2519 Schematic ( PDF Datasheet ) - BPS

Teilenummer BP2519
Beschreibung PSR Isolated CCCV Driver IC
Hersteller BPS
Logo BPS Logo 




Gesamt 7 Seiten
BP2519 Datasheet, Funktion
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






BP2519 Datasheet, Funktion
晶丰明源半导体
LED current is defined as:
I OUT
I PK
2
Constant Voltage Control
BP2519 senses the conductor voltage by divider
resistor on FB pin. The constant output voltage is
ensured by this sense voltage and internal reference in
close loop.
The output voltage VOUT is defined as:
VO (RFBL RFBH ) * 3
RFBL
Where,
RFBL is pull down resistor on FB pin;
RFBH is pull high resistor on FB pin;
Multiple mode control: PWM/PFM
BP2519 is to use multiple mode control to improve
the performance on efficiency, standby power, and
audible noise in low load condition.
Vout
PFM
PWM
PFM
BP2519
PSR Isolated CCCV Driver IC
reliability, including output overvoltage protection,
load short protection, Vcc under voltage lock out
protection, over temperature protection.
This sense voltage on FB is also serve for load over
voltage protection. The detection threshold is 4V on
FB, and the Vovp defined as:
VOVP 4 * (RFBL RFBH )
RFBL
Where Vovp is the design expectation on OVP.
When the sense voltage on FB is under 0.5V, as
default the system would open guard for short
protection and operating frequency clamped to 20kHz,
which could save the stress on MOSFET. The system
will restart after 48ms timeout.
During any fault condition, the Vcc voltage would be
discharged. As well the Vcc voltage under UVLO
threshold, the system will restart till shift to normal
condition once the fault condition removed.
PCB Design Guide
Suggestions for PCB layout of BP2519 application: 1.
Bypass Capacitor on Vcc:
The bypass capacitor on VCC pin should be as close as
possible to the VCC Pin and GND pin.
2. Divider resistor for FB pin
+/-5%
CV
mode
Protections
CC
mode
VCC
restart
+/-5%
Iout
Put the divider resistor close to the FB pin as possible,
and keep the trace away to the switching node.
3. GND
Keep a short and wide ground path for current sense
resistor, especially for the main current loop. The IC
signal ground for FB components should be
connected to the IC GND.
4. The Area of Power Loop
The area of main current loop should be as small as
possible to reduce EMI radiation.
BP2519 offers rich protections to improve the system
BP2519_EN_DS_Rev.1.0
www.bpsemi.com
BPS Confidential Customer Use Only
6

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