High Precision CC/CV Primary-Side PWM Power Switch
OB25135/6Q
GENERAL DESCRIPTION
OB25135/6Q 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.
OB25135/6Q 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.
OB25135/6Q is offered in SOP8 package.
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
Quasi-resonant operation for highest overall
efficiency
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)
fid
Figure.1. Typical CC/CV Curve
TYPICAL APPLICATION
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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
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Datasheet
OB_DOC_DS_25135/6QA1
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High Precision CC/CV Primary-Side PWM Power Switch
OB25135/6Q
GENERAL INFORMATION
Pin Configuration
Absolute Maximum Ratings
Parameter
OB25135/6Q
CB Voltage
VDD Voltage
FB Input Voltage
CS Input Voltage
Min/Max Operating Junction
Temperature T
J
Operating
Ambient
Temperature T
A
Min/Max
Storage
Temperature T
stg
Lead
Temperature
(Soldering, 10secs)
Value
750V
-0.3 to 20V
-0.3 to 7V
-0.3 to 7V
FB
GND
VDD
CS
1
2
3
4
8
7
6
5
C
C
C
C
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Recommended Operating Condition
Symbol
Parameter
Range
VDD
VDD Supply Voltage
5 to 16V
fid
Package Dissipation Rating
Package
RθJA (℃/W)
SOP8
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Ordering Information
Part Number
Description
OB25135QCP
SOP8, Halogen-free, Tube
OB25135QCPA
SOP8, Halogen-free, T&R
OB25136QCP
SOP8, Halogen-free, Tube
OB25136QCPA
SOP8, Halogen-free, T&R
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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
Adapter
Note1
Product
90V~264V
OB25135Q
10W
OB25136Q
12W
Note:
Maximum practical continuous power in an adapter
design with sufficient drain pattern as a heat sink, at 40℃
ambient.
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Datasheet
OB_DOC_DS_25135/6QA1
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-40 to 150
℃
-20 to 85
℃
-55 to 150
℃
260
℃
High Precision CC/CV Primary-Side PWM Power Switch
OB25135/6Q
ELECTRICAL CHARACTERISTICS
(TA = 25℃, VDD=15V, if not otherwise noted)
Symbol
Parameter
Supply Voltage (VDD) Section
I start-up
Start up current
Operation
current
without
switching
UVLO(OFF)
VDD under voltage lockout exit
UVLO(ON)
VDD under voltage lockout enter
VDD_OVP
VDD over voltage protection
VDD_max
Max. Operating Voltage
Current Sense Input Section
TLEB
LEB time
Vth_ocp_min Minimum over current threshold
Vth_ocp_max Maximum over current threshold
Ton_max
Maximum Ton
Td_oc
OCP propagation delay
FB Input Section
Reference voltage for feedback
Vref_fb
threshold
Tpause_min
Minimum Toff
F_min
Minimum frequency
F_max
Maximum frequency
Maximum cable compensation
Icomp_cable
current
Output Over Voltage Protection
Vovp
Output Over voltage threshold
On chip Over temperature Section
Over temperature protection
T_otp
trigger point
Over temperature protection
T_otp_rec
recovery point
I op
Test Conditions
VDD=UVLO_OFF-1V
Min
Typ.
1
0.77
12
3.5
17
13
3.7
18
Max
3
1.0
Unit
uA
mA
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Vcbeo(V)
Note2
Collector-base
voltage
Min.
750
750
Typ.
-5-
lt
2.475
450
90
2.85
Max.
o
485
0.33
500
555
40
100
en
2.500 2.525
2.0
500
53
3.00
165
130
3.15
550
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Power BJT Section
Parameter
Vceo(V)
Note1
Collector-emitter breakdown
voltage
Min.
Typ.
450
450
Max.
Ic (A)
breakdown Collector
Current
Min.
Typ.
1.2
1.6
Peak
Max.
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Product
OB25135
OB25136
Note1：Test condition：Ic=10mA, Ib=0
Note2：Test condition：Ic=10mA
©On-Bright Electronics
Confidential
Datasheet
OB_DOC_DS_25135/6QA1
尔
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14
3.9
19
16
V
V
V
V
515
us
mV
mV
us
ns
V
us
Hz
KHz
uA
V
℃
℃
FPGA/CPLD
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