Document
OB2223F
High Precision Low Cost MCM Power Switch
GENERAL DESCRIPTION
OB2223F is a high performance, high precision and low cost PWM Power switch for non-isolated buck and flyback application. It combines a dedicated current mode PWM controller (with a high voltage power MOSFET with SOP8/DIP7 package) and built-in error amplifier optimized for good overshoot and dynamic response for low cost and component count. With precise inner resistor divider, precise reference of EA , accurate constant voltage regulation 12V at universal AC input can be guaranteed. For high efficiency, oscillator with frequency-reduction and burst mode control is implemented. And EMI performance is achieved with On-Bright proprietary frequency shuffling technique and soft gate driver design. OB2223F offers power on soft start control and protection coverage with auto-recovery features including Cycle-by-Cycle current limiting, Over Loading Protection, Output Short-Circuit Protection, On-Chip OTP,VDD OVP, and UVLO.
TYPICAL APPLICATION
FEATURES
• Low cost and component count buck application
• Current Mode Control • Multiple mode control with good dynamic
response • Oscillator of fixed maximum switching
frequency with frequency-reduction and burst mode control for high efficiency • Frequency shuffling for EMI improvement • Power on Soft-start • Built-in Leading Edge Blanking (LEB) • Cycle-by-Cycle Current Limiting • Over Loading Protection • Output Short-Circuit Protection • VDD Under Voltage Lockout with Hysteresis (UVLO) • VDD OVP • On-Chip OTP
APPLICATIONS
Low Power AC/DC offline SMPS for • Electrical Appliance • Linear Regulator/RCC Replacement
OB2223F is offered in SOP8/DIP7 package.
AC IN
OB2223F
1 VDD
GND 8
2 COMP GND* 7 3 ENB DRAIN 6
4 CS
DRAIN 5
Note : GND* Only in SOP8 package
©On-Bright Electronics
Confidential -1-
DC OUT
Preliminary Datasheet OB_DOC_DS_2223F00
OB2223F
High Precision Low Cost MCM Power Switch
GENERAL INFORMATION
Pin Configuration The pin map is shown as below for SOP8/DIP7
VDD 1
8 GND
COMP 2
ENB
3
SOP
7 6
GND DRAIN
CS 4
5 DRAIN
VDD 1
7 GND
COMP 2
ENB
3
DIP 6 DRAIN
CS 4
5 DRAIN
Ordering Information
Part Number
Description
OB2223FCP
SOP8, Pb-free, Tube
OB2223FCPA
SOP8, Pb-free, T&R
OB2223FAP
DIP7, Pb-free, Tube
Package Dissipation Rating
Package
RθJA (℃/W)
SOP8
90
DIP7
75
Note: Drain Pin Connected 100mm2 PCB copper
clad.
Absolute Maximum Ratings
Parameter
Value
Drain Voltage (off state)
-0.3V to Bvdss
VDD Voltage
-0.3 to 40V
VDD Zener Clamp Continuous Current
10 mA
COMP Voltage
-0.3 to 7V
CS Input Voltage
-0.3 to 7V
ENB Voltage
-0.3 to 7V
Min/Max Operating
Junction Temperature TJ Min/Max Storage
Temperature Tstg Lead Temperature
(Soldering, 10secs)
-40 to 150 ℃ -55 to 150 ℃ 260 ℃
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
Confidential -2-
Preliminary Datasheet OB_DOC_DS_2223F00
Marking Information
OB2223F
High Precision Low Cost MCM Power Switch
TERMINAL ASSIGNMENTS
Pin Num 1 2 3 4
5/6
7 8
Pin Name VDD COMP ENB CS
DRAIN
GND GND
I/O Description
P Power Supply and Output Voltage Feedback
I Compensation Pin. Connect a Cap to GND
I Connected to GND for 12V output
I Current sense input
O
HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of the transformer / inductance.
P Ground
P Ground (Only in SOP8 package)
©On-Bright Electronics
Confidential -3-
Preliminary Datasheet OB_DOC_DS_2223F00
BLOCK DIAGRAM
OVP
OB2223F
High Precision Low Cost MCM Power Switch
Note: GND* only in SOP8 package
©On-Bright Electronics
Confidential -4-
Preliminary Datasheet OB_DOC_DS_2223F00
OB2223F
High Precision Low Cost MCM Power Switch
ELECTRICAL CHARACTERISTICS
(TA = 25℃, VDD=16V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Min
Supply Voltage (VDD) Section
I DD ST
Standby Current
VDD=UVLO(off) -1V
I DD op
Operation Current
Operation supply current CS=0V, VDD=12V
-
Operation supply current CS=0V, VDD=12V, CL=0.5nF
UVLO(ON)
VDD Under Voltage Lockout Enter
VDD falling
6.0
UVLO(OFF)
VDD Under Voltage Lockout Exit
VDD rising
11.5
OVP
Over voltage protection Ramp VDD until gate
Threshold
shut down
23
Vpmos
Pull-up PMOS Active
CS=0V,Comp=3V
VDD Regulation Voltage
In normal regulation, VDD will be regulated to 12.5V
Ramp VDD until Comp voltage lower than 2.5V
12.0
Current Sense Input Section
TLEB
LEB time
Vth_oc
Over current threshold
890
Td_oc
OCP Propagation delay
ZSENSE_IN
Input Impedance
Frequency Section
Freq_MaxNote 1 IC Maximum frequency
50 27
△f/Freq
Frequency shuffling range
F_shuffling
Shuffling f.