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OB2535
High Precision CC/CV Primary-Side PWM Power Switch
GENERAL DESCRIPTION
OB2535 is a high performance offline PWM Power switch for low power AC/DC charger and adaptor applications. It operates in primary-side nsing and regulation. Conquently, opto-coupler and TL431 could be eliminated. Proprietary Constant Voltage (CV) and Constant Current (CC) control is i
ntegrated as shown in the figure below.
In CC control, the current and output power tting can be adjusted externally by the n 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.
OB2535 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 OB2535. .
Fig.1. Typical CC/CV Curve
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
武汉好玩的地方排行榜OB2535 is offered in SOP8 package.
TYPICAL APPLICATION
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OB2535
High Precision CC/CV Primary-Side PWM Power Switch
GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for SOP8
VDD COMP INV
CS
GND GND
Ordering Information Part Number Description OB2535CP SOP8, Pb-free, Tube OB2535CPA SOP8, Pb-free, T&R
Package Dissipation Rating Package R θJA (℃/W) SOP8 90
Note: Drain Pin Connected 100mm 2 PCB copper clad.
Absolute Maximum Ratings
Parameter Value Drain Voltage (off state) -0.3V to Bvdss VDD Voltage -0.3 to V DD _clamp VDD Zener Clamp Continuous Current 10 mA COMP Voltage -0.3 to 7V CS Input Voltage -0.3 to 7V INV Input Voltage -0.3 to 7V Min/Max Operating Junction Temperature T J -20 to 150 o C Min/Max Storage Temperature T stg -55 to 150 o C Lead Temperature (Soldering, 10cs) 260 o C走进校园
便便蛋糕Note: Stress beyond tho listed under “absolute maximum ratings” may cau permanent damage to the device. The are stress ratings only, functional operation of the device at the or any other conditions beyond tho indicated under “recommended operating conditions” is not implied. Exposure to absolute maximum-rated conditions for extended periods may affect device reliability.
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OB2535
High Precision CC/CV Primary-Side PWM Power Switch
Marking Information
OB2535CP YWW
S
C:SOP8 Package P:Pb-free Package Y:Year Code(0-9)
WW:Week Code(01-52)S:Internal Code(Optional)
TERMINAL ASSIGNMENTS
Pin Num Pin Name I/O Description 1 VDD P Power Supply 2 COMP I Loop Compensation for CV Stability
3 INV I The voltage feedback from auxiliary winding. Connected to resistor divider
from auxiliary winding reflecting output voltage. PWM duty cycle is
determined by EA output and current n signal at pin 4.
4 CS I Current n input
5/6 DRAIN O
HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of
the transformer
7/8 GND P Ground
OUTPUT POWER TABLE
230VAC±15% 85-264VAC Product Adapter 1 Adapter 1
OB2535 6W 5W
Notes:
1.
Maximum practical continuous power in an Adapter design with sufficient drain pattern as a heat sink, at 50℃ ambient.
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ELECTRICAL CHARACTERISTICS
(T A = 25O C, VDD=VDDG=16V, if not otherwi noted)
Symbol Parameter Test Conditions Min Typ Max Unit
Supply Voltage (VDD) Section I DD ST Standby Current VDD=13V
5 20
uA I DD op Operation Current
Operation supply current INV=2V, CS=0V,
VDD=VDDG=20V
-
2.5 3.5 mA
UVLO(ON) VDD Under Voltage Lockout Enter VDD falling 7.5 8.5 10
V UVLO(OFF) VDD Under Voltage Lockout Exit VDD rsing
13.5 14.5 16.0
V V DD _clamp Maximum VDD operation
voltage
I DD =10mA
30.5 32.5 34．5
V OVP
Over voltage protection Threshold
Ramp VDD until gate shut down
27.5 29.5 31.5
V Current Sen Input Section
TLEB LEB time
540 ns Vth_oc Over current threshold
870 900 930 mV
Td_oc OCP Propagation delay
150 ns Z SENSE _IN Input Impedance
50 Kohm
T_ss
Soft start time
10
ms
Frequency Section
Freq_Max Note 1 IC Maximum frequency
66 72 78 KHz
Freq_Nom
System Nominal switch frequency
60
KHz
Freq_startup INV =0V, Comp =5V 14 KHz △f/Freq
Frequency shuffling range
虾仁丸子
+/-4
% Error Amplifier ction Vref_EA Reference voltage for EA 1.97
2 2.0
3 V Gain
DC gain of EA
60 dB I_COMP_MAX
Max. Cable compensation
current
INV=2V, Comp=0V
42
uA
Power MOSFET Section BVdss MOSFET Drain-Source Breakdown Voltage 600 V Rdson
On Resistance
眼睛下方有痣
Static, Id=0.4A
12
15
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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.
