OB2536 Datasheet PDF - On-Bright Electronics
| Part Number | OB2536 | |
| Description | High Precision CC/CV Primary-Side PWM Controller | |
| Manufacturers | On-Bright Electronics | |
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OB2536
High Precision CC/CV Primary-Side PWM Controller
Product Specification
GENERAL DESCRIPTION
OB2536 is a high performance offline PWM Power
switch for low power AC/DC charger and adaptor
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.
OB2536 offers power on soft start control and
protection coverage with auto-recovery features
including Cycle-by-Cycle current limiting, VDD
OVP, VDD clamp and UVLO. Excellent EMI
performance is achieved with On-Bright
proprietary frequency shuffling technique.
High precision constant voltage (CV) and constant
current (CC) can be achieved by OB2536.
.
FEATURES
5% Constant Voltage Regulation, 5%
Constant Current Regulation at Universal AC
input
Primary-side Sensing and Regulation Without
TL431 and Opto-coupler
Programmable CV and CC Regulation
Adjustable Constant Current and Output
Power Setting
Built-in Secondary Constant Current Control
with Primary Side Feedback
Built-in Adaptive Current Peak Regulation
Built-in Primary winding inductance
compensation
Programmable Cable drop Compensation
Power on Soft-start
Built-in Leading Edge Blanking (LEB)
Cycle-by-Cycle Current Limiting
VDD Under Voltage Lockout with Hysteresis
(UVLO)
VDD OVP
VDD Clamp
APPLICATIONS
Low Power AC/DC offline SMPS for
Cell Phone Charger
Digital Cameras Charger
Small Power Adaptor
Auxiliary Power for PC, TV etc.
Linear Regulator/RCC Replacement
OB2536 is offered in DIP8 package.
Fig.1. Typical CC/CV Curve
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_253600
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OB2536
High Precision CC/CV Primary-Side PWM Controller
ELECTRICAL CHARACTERISTICS
(TA = 25℃, VDD=VDDG=16V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage (VDD) Section
I DD ST
I DD op
Standby Current
Operation Current
VDD=13V
Operation supply current
INV=2V, CS=0V,
-
VDD=VDDG=18V
5
2
20 uA
3 mA
UVLO(ON)
VDD Under Voltage Lockout Enter VDD falling
8.2 9.0 10.5 V
UVLO(OFF)
VDD Under Voltage Lockout Exit VDD rising
13.5 14.8 16.0 V
VDD_clamp
OVP
Maximum VDD operation voltage IDD=10mA
Over voltage protection Threshold
Ramp VDD until gate
shut down
27 28.5 30
26 27.5 29
V
V
Current Sense Input Section
TLEB
LEB time
625 ns
Vth_oc
Over current threshold
880 910 940 mV
Td_oc
OCP Propagation delay
110 ns
ZSENSE_IN
T_ss
Input Impedance
Soft start time
50
17
Kohm
ms
Frequency Section
Freq_MaxNote 1 IC Maximum frequency
55 60 65 KHz
Freq_Nom
System Nominal switch frequency
50 KHz
Freq_startup
INV=0V, Comp=5V
14 KHz
△f/Freq
Frequency shuffling range
+/-6 %
Error Amplifier section
Vref_EA
Reference voltage for EA
1.97 2
2.03 V
Gain
DC gain of EA
60 dB
I_COMP_MAX
Max. Cable compensation
current
INV=2V, Comp=0V
37.5
uA
Power MOSFET Section
BVdss
MOSFET Drain-Source
Breakdown Voltage
600 V
Rdson
On Resistance
Static, Id=0.45A
10 Ώ
Note:
1. Freq_Max indicates IC internal maximum clock frequency. In system application, the maximum operation frequency of 60Khz
nominal occurs at maximum output power or the transition point from CV to CC.
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
OB_DOC_DS_253600
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for OB2536 electronic component. |
| Information | Total 10 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ OB2536.PDF Datasheet ] | |
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