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PDF OB2535 Data sheet ( Hoja de datos )
| Número de pieza | OB2535 | |
| Descripción | High Precision CC/CV Primary-Side PWM Power Switch | |
| Fabricantes | On-Bright Electronics | |
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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 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.
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.
.
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
OB2535 is offered in SOP8 package.
Fig.1. Typical CC/CV Curve
TYPICAL APPLICATION
©On-Bright Electronics
-1-
Confidential
OB_DOC_DS_253502
1 page  
OB2535
High Precision CC/CV Primary-Side PWM Power Switch
ELECTRICAL CHARACTERISTICS
(TA = 25OC, VDD=VDDG=16V, if not otherwise 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
VDD_clamp
Maximum VDD operation
voltage
IDD=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 Sense Input Section
TLEB
LEB time
540 ns
Vth_oc
Over current threshold
870 900 930 mV
Td_oc
OCP Propagation delay
150 ns
ZSENSE_IN
T_ss
Input Impedance
Soft start time
50 Kohm
10 ms
Frequency Section
Freq_MaxNote 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
+/-4 %
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
42
uA
Power MOSFET Section
BVdss
MOSFET Drain-Source
Breakdown Voltage
600 V
Rdson
On Resistance
Static, Id=0.4A
12 15
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
-5-
Confidential
OB_DOC_DS_253502
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet OB2535.PDF ] | |
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