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OB2216
Primary-Side Regulation PWM Power Switch
GENERAL DESCRIPTION
OB2216 is an 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. Device operates in fixed frequency mode
at large load conditions, frequency reduction mode at
light/medium load and ‘Extended burst mode’ at
No/light load conditions.
OB2216 offers power on soft start control and
protection coverage with auto-recovery features
including Cycle-by-Cycle current limiting, VDD
clamp and UVLO. Excellent EMI performance is
achieved with On-Bright proprietary frequency
shuffling technique together with soft switching
control at the totem pole gate drive output.
FEATURES
„ Primary-side Sensing and Regulation Without
TL431 and Opto-coupler
„ Multi-mode Operation for High Efficiency
„ Programmable CV and CC Regulation
„ Adjustable Constant Current and Output Power
setting
„ Frequency Shuffling and Adjustable Gate Drive
Greatly Improving EMI
„ Power on Soft-start Time (4ms)
„ “Extended Burst Mode Control” for Improved
Efficiency and Minimum Standby Design
„ Built-in Leading Edge Blanking (LEB)
„ Cycle-by-Cycle Current Limiting
„ VDD Under Voltage Lockout with Hysteresis
(UVLO)
„ 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
OB2216 is offered in DIP8 package
Fig 1. Typical CC/CV Curve
TYPICAL APPLICATION
©On-Bright Electronics
-1-
Confidential
OB_DOC_DS_1601
Free Datasheet http://www.datasheet4u.net/

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GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for DIP8.
Ordering Information
Part Number Description
OB2216AP
DIP8, Pb-free
OB2216
Primary-Side Regulation PWM Power Switch
Absolute Maximum Ratings
Parameter
Drain Voltage (off state)
Value
-0.3V to Bvdss
VDD Voltage
VDDG Voltage
VDD Zener Clamp
-0.3 to VDD_clamp
-0.3 to VDD_clamp
10 mA
Continuous Current
CS Input Voltage
-0.3 to 7V
INV Input Voltage
Min/Max Operating
-0.3 to 7V
-20 to 150 oC
Junction Temperature TJ
Min/Max Storage
-55 to 150 oC
Temperature Tstg
Lead Temperature
260 oC
(Soldering, 10secs)
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.
©On-Bright Electronics
-2-
Confidential
OB_DOC_DS_1601
Free Datasheet http://www.datasheet4u.net/

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Marking Information
OB2216
Primary-Side Regulation PWM Power Switch
TERMINAL ASSIGNMENTS
Pin Num Pin Name
1 VDDG
2 VDD
3 INV
4 CS
5/6 Drain
7/8 GND
I/O Description
P Internal Gate Driver Power Supply
P IC DC power supply Input
Inverting input of error amplifier (EA). Connected to resistor divider from
I primary sensing winding reflecting output voltage. PWM duty cycle is
determined by EA output and current sense signal at pin 4.
I Current sense input
O
HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of
the transformer
P Ground
Output Power Table
Product
OB2216
230VAC±15%
Open Frame1
20W
85-264VAC
Open Frame1
15W
Notes:
1. Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sink, at 50ambient.
©On-Bright Electronics
-3-
Confidential
OB_DOC_DS_1601
Free Datasheet http://www.datasheet4u.net/