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PDF OB2500N Datasheet ( Hoja de datos )

Número de pieza OB2500N
Descripción High Precision CC/CV Primary-Side Power Switch
Fabricantes On-Bright Electronics 
Logotipo On-Bright Electronics Logotipo

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OB2500N Hoja de datos, Descripción, Manual
OB2500N
High Precision CC/CV Primary-Side Power Switch
GENERAL DESCRIPTION
OB2500N is a high performance offline PSR
power switch for low power AC/DC charger and
adapter applications. It operates in primary-side
sensing and regulation. Consequently,
opto-coupler and TL431 could be eliminated.
Proprietary Constant Voltage (CV) and Constant
Current (CC) control is integrated as shown in the
figure below.
In CC control, the current and output power setting
can be adjusted externally by the sense resistor
Rs at CS pin. In CV control, multi-mode operations
are utilized to achieve high performance and high
efficiency. In addition, good load regulation is
achieved by the built-in cable drop compensation.
Device operates in PFM in CC mode at large load
condition and it operates in PWM with frequency
reduction at light/medium load. The chip
consumes very low operation current. It achieves
less than 75mW standby power to meet strict
standby power standard.
OB2500N offers comprehensive protection
coverage with auto-recovery feature including
Cycle-by-Cycle current limiting, VDD over voltage
protection, feedback loop open protection, short
circuit protection, built-in leading edge blanking,
VDD under voltage lockout (UVLO), OTP etc.
OB2500N is offered in SOP7 packages.
FEATURES
Primary-side sensing and regulation without
TL431 and opto-coupler
High precision constant voltage and current
regulation at universal AC input
Multi-mode PWM/PFM operation for efficiency
improving
Integrated 1A 650V MOSFET
Good dynamic response
Programmable CV and CC regulation
Built-in primary winding inductance
compensation
Programmable cable drop compensation
No need for control loop compensation
Audio noise free operation
Built-in leading edge blanking (LEB)
Ultra low start-up current and low operating
current
Comprehensive protection coverage with
auto-recovery
On-chip OTP and external OTP
VDD over voltage protection
VDD under voltage lockout with
hysteresis (UVLO)
Cycle-by-Cycle current limiting
Feedback loop open protection
Output short circuit protection
APPLICATIONS
Low Power AC/DC offline SMPS for
Cell Phone Charger
Digital Cameras Charger
Small Power Adapter
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
Figure.1. Typical CC/CV Curve
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_2500N00

1 page

OB2500N pdf
OB2500N
High Precision CC/CV Primary-Side Power Switch
ELECTRICAL CHARACTERISTICS
(TA = 25, VDD=15V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Supply Voltage (VDD) Section
I start-up
Start up current
VDD=UVLO_OFF-1V
I static
Static current
UVLO(OFF)
VDD under voltage lockout exit
UVLO(ON)
VDD under voltage lockout
enter
VDD_OVP
VDD over voltage protection
Max. Operating
Voltage
Current Sense Input Section
TLEB
LEB time
Vth_ocp_min
Minimum over current threshold
Vth_ocp_max
Maximum
threshold
over
current
FB Input Section
Vref_FB
Reference voltage for feedback
threshold
Tpause_min
Minimum Toff
F_min
Minimum frequency
F_max
Maximum frequency
Icomp_cable
Maximum cable compensation
current
Vth_cc_shutdown CC mode shut down threshold
Td_cc_shutdown CC mode shut down debounce
Output Over Voltage Protection
V_OVP
Output Over voltage threshold
RT Section
I_otp
RT pin source current
V_otp
Over temperature trigger
voltage
MOSFET Section
BVdss
Mosfet
Drain-Source
Breakdown Voltage
Rdson
Static drain to source on
resistance
Min Typ. Max Unit
5
0.85 1.0
16.0 18.2 20.5
6.5 7.0 7.5
26.0 27.0 28.0
25
uA
mA
V
V
V
V
300
485 500 515
590
ns
mV
mV
2.475 2.500 2.525 V
2.0
700 780 860
90
us
Hz
KHz
40 45 50 uA
1.55 V
1024
2048 cycle
2.85 3.0 3.15 V
72 uA
1.0 V
650
9
V
Ώ
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
OB_DOC_DS_2500N00

5 Page

OB2500N arduino
OB2500N
High Precision CC/CV Primary-Side Power Switch
IMPORTANT NOTICE
RIGHT TO MAKE CHANGES
On-Bright Electronics Corp. reserves the right to make corrections, modifications, enhancements,
improvements and other changes to its products and services at any time and to discontinue any product
or service without notice. Customers should obtain the latest relevant information before placing orders
and should verify that such information is current and complete.
WARRANTY INFORMATION
On-Bright Electronics Corp. warrants performance of its hardware products to the specifications applicable
at the time of sale in accordance with its standard warranty. Testing and other quality control techniques
are used to the extent it deems necessary to support this warranty. Except where mandated by
government requirements, testing of all parameters of each product is not necessarily performed.
On-Bright Electronics Corp. assumes no liability for application assistance or customer product design.
Customers are responsible for their products and applications using On-Bright’s components, data sheet
and application notes. To minimize the risks associated with customer products and applications,
customers should provide adequate design and operating safeguards.
LIFE SUPPORT
On-Bright Electronics Corp.’s products are not designed to be used as components in devices intended to
support or sustain human life. On-bright Electronics Corp. will not be held liable for any damages or claims
resulting from the use of its products in medical applications.
MILITARY
On-Bright Electronics Corp.’s products are not designed for use in military applications. On-Bright
Electronics Corp. will not be held liable for any damages or claims resulting from the use of its products in
military applications.
©On-Bright Electronics
Confidential
- 11 -
Preliminary Datasheet
OB_DOC_DS_2500N00

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