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PDF OB2520 Data sheet ( Hoja de datos )
| Número de pieza | OB2520 | |
| Descripción | High Precision CC/CV Primary-Side Controller | |
| Fabricantes | On-Bright Electronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OB2520 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
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OB2520
High Precision CC/CV Primary-Side Controller
GENERAL DESCRIPTION
OB2520 is a high performance offline PSR
controller 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, PFM operations are
utilized to achieve high performance and high
efficiency. In addition, good load regulation is
achieved by the built-in cable drop compensation.
The chip consumes very low operation current
(typical 300uA), it can achieve less than 30mW
standby power to meet strict standby power
standard.
OB2520 offers comprehensive protection
coverage with auto-recovery features 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), etc.
OB2520 is offered in SOT23-6 package.
Product Specification
FEATURES
±5% Constant Voltage Regulation at
Universal AC input
High precision Constant Current Regulation at
Universal AC input
Primary-side Sensing and Regulation Without
TL431 and Opto-coupler
Programmable CV and CC Regulation
Built-in Primary winding inductance
compensation
Programmable Cable Drop Compensation
Driver BJT Switch
Ultra Low Start-up Current (Typ. 1uA)
VDD Over Voltage Protection
Built-in Feedback Loop Open Protection
Built-in Short Circuit Protection
Built-in Leading Edge Blanking (LEB)
Cycle-by-Cycle Current Limiting
VDD Under Voltage Lockout with Hysteresis
(UVLO)
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
~ ++
AC
VO
+ CO
NS
NP
+
VDD GND
FB BASE
VC CS
OB2520
RS
NAUX
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_252000
1 page  
OB2520
High Precision CC/CV Primary-Side Controller
ELECTRICAL CHARACTERISTICS
(TA = 25℃, VDD=15V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ
Supply Voltage (VDD) Section
I start-up
Start up current
VDD=11V
1
I static
Static current
VDD=15V
300
UVLO(OFF) VDD under voltage lockout exit
11.5 12.5
UVLO(ON)
VDD under voltage lockout enter
6.0 6.8
VDD_OVP
VDD over voltage protection
25 27
Max. Operating
Voltage
Current Sense Input Section
TLEB
LEB time
0.5
Vth_ocp
Over current threshold
485 500
Td_oc
OCP propagation delay
From ocp comparator to
base drive
100
FB Input Section
Vref_fb
Reference voltage for feedback
threshold
1.98 2.00
Tpause_min
2.0
Tpause_max Maximum pause
8 10
Icomp_cable
Maximum cable compensation
current
42 45
BASE Drive Section
Is_max
Base sourcing maximum current
20 30
Is_preoff
Base sourcing current after
pre-off
0.5 1
Rdson_l
Base drive low side on resistor
1
Max Unit
3 uA
400 uA
13.5 V
7.6 V
29 V
25 V
uS
515 mV
ns
2.02 V
uS
12 mS
48 uA
40 mA
1.5 mA
ohm
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
OB_DOC_DS_252000
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet OB2520.PDF ] | |
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