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OB2513x
High Precision CC/CV Primary-Side PWM Power Switch
GENERAL DESCRIPTION
OB2513x 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 as well at
large load condition and it operates in PWM with
frequency reduction at light/medium load. The chip
consumes very low operation current, it can
achieve less than 75mW standby power.
OB2513x offers comprehensive protection
coverage with auto-recovery features including
Cycle-by-Cycle current limiting, VDD over voltage
protection, short circuit protection, built-in leading
edge blanking, VDD under voltage lockout (UVLO),
OTP etc.
OB2513x is offered in SOP7 package.
Figure.1. Typical CC/CV Curve
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
Good dynamic response
Programmable CV and CC regulation
Built-in line voltage and primary winding
inductance compensation
Programmable cable drop compensation
No need for control loop compensation
Audio noise free operation
Internal BJT switch
Built-in leading edge blanking (LEB)
Comprehensive protection coverage with
auto-recovery
VDD over voltage protection
VDD under voltage lockout with
hysteresis (UVLO)
Cycle-by-cycle current limiting
Feedback loop open protection
Output short circuit protection
Over temperature protection (OTP)
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
TYPICAL APPLICATION
~ ++
AC
+
VDD GND
FB
NC C
CS C
RS OB2513x
VO
+ CO
NS
NP
NAUX
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Datasheet
OB_DOC_DS_2513XA0

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OB2513x
High Precision CC/CV Primary-Side PWM Power Switch
GENERAL INFORMATION
Pin Configuration
Ordering Information
Part Number
Description
OB2513xJP
SOP7, Pb-free, Tube
OB2513xJPA
SOP7, Pb-free, T&R
Package Dissipation Rating
Package
RθJA (/W)
SOP7
95
Recommended Operating Condition
Symbol Parameter
Range
VDD
VDD Supply Voltage 5 to 16V
Absolute Maximum Ratings
Parameter
Value
OB2513x CB Voltage
800V
VDD Voltage
-0.3 to 20V
FB Input Voltage
-0.3 to 7V
CS Input Voltage
-0.3 to 7V
Min/Max Operating Junction
Temperature TJ
Operating
Ambient
Temperature TA
Min/Max Storage
Temperature Tstg
Lead Temperature
(Soldering, 10secs)
-40 to 150
-20 to 85
-55 to 150
260
Note: Stresses beyond those listed under “absolute maximum
ratings” may cause permanent damage to the device. These
are stress ratings only, functional operation of the device at
these or any other conditions beyond those indicated under
“recommended operating conditions” is not implied. Exposure
to absolute maximum-rated conditions for extended periods
may affect device reliability.
Recommended Output power Table
Product
AdapterNote1
90V~264V
OB25132
3.5W
OB25133
5.0W
OB25134
7.5W
Notes: 1. Maximum practical continuous power in an adapter
design with sufficient drain pattern as a heat sink, at 40
ambient
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OB2513x
High Precision CC/CV Primary-Side PWM Power Switch
Marking Information
YWWZZZ
OB25134JP
S
Y:Year Code
WW:Week Code(01-52)
ZZZ:Lot Code
J:SOP7 Package
P:Pb-free Package
S:Internal Code(Optional)
TERMINAL ASSIGNMENTS
Pin Num Pin Name
1 VDD
2 FB
3
4
56
7
NC
CS
C
GND
I/O Description
P Power Supply
I
The voltage feedback from auxiliary winding. Connected to resistor
divider from auxiliary winding reflecting output voltage.
I Current sense input
P HV BJT collector pin.
P Ground
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OB2513x
High Precision CC/CV Primary-Side PWM Power Switch
BLOCK DIAGRAM
VDD
POR
UVLO
NC
Internal
Power Supply
Supply
OVP
Output
OVP
CC
Controller
Drop
Comp
FB Vref
EA
sampler
Logic core
CV
Controller
Base
Driver
C
OCP
LEB
CS
GND
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Datasheet
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OB2513x
High Precision CC/CV Primary-Side PWM Power Switch
ELECTRICAL CHARACTERISTICS
(TA = 25, VDD=15V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Min
Supply Voltage (VDD) Section
I start-up
Start up current
VDD=UVLO_OFF-1V
I op
Operation
switching
current
without
UVLO(OFF) VDD under voltage lockout exit
12
UVLO(ON) VDD under voltage lockout enter
3.5
VDD_OVP VDD over voltage protection
17
VDD_max
Max. Operating Voltage
Current Sense Input Section
TLEB
LEB time
Vth_ocp_min Minimum over current threshold
485
Vth_ocp_max Maximum over current threshold
Ton_max
Maximum Ton
Td_oc
OCP propagation delay
FB Input Section
Vref_fb
Reference voltage for feedback
threshold
2.475
Tpause_min Minimum Toff
F_min
Minimum frequency
450
Icomp_cable
Maximum cable compensation
current
Output Over Voltage Protection
Vovp
Output Over voltage threshold
2.85
On chip Over temperature Section
T_otp
Over temperature protection
trigger point
T_otp_rec
Over temperature protection
recovery point
Typ. Max
13
0.77 1.0
13 14
3.7 3.9
18 19
20
0.33
500 515
555
40
100
2.500 2.525
2.0
500 550
53
3.00 3.15
165
130
Unit
uA
mA
V
V
V
V
us
mV
mV
us
ns
V
us
Hz
uA
V
Power BJT Section
Vceo(V) Note1
Parameter Collector-emitter breakdown
Product
voltage
Min. Typ. Max.
OB25132
450
OB25133
450
OB25134
450
Vcbeo(V)Note2
Ic (A)
Collector-base
voltage
breakdown Collect Peak Current
Min. Typ. Max. Min. Typ. Max.
800 0.35
800 0.50
800 0.8
Note1Test conditionIc=10mA, Ib=0
Note2Test conditionIc=10mA
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Datasheet
OB_DOC_DS_2513XA0