OB2223.pdf 데이터시트 (총 11 페이지) - 파일 다운로드 OB2223 데이타시트 다운로드

No Preview Available !

OB2223
High Precision Low Cost MCM Power Switch
GENERAL DESCRIPTION
OB2223 is a high performance, high precision and
low cost PWM Power switch for Non-isolated
buck/ buck-boost and flyback application. It
combines a dedicated current mode PWM
controller (with a high voltage power MOSFET
with SOP8/DIP8 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.
OB2223 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.
OB2223 is offered in SOP8/DIP8 package
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
.
AC IN
VDD
GND
COMP GND
ENB DRAIN
CS DRAIN
DC
OUT
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
TEL0755-82584090

No Preview Available !

GENERAL INFORMATION
Pin Configuration
The pin map is shown as below for DIP8
VDD 1
8 GND
COMP 2
7 GND
ENB
3
6 DRAIN
CS 4
5 DRAIN
Ordering Information
Part Number
Description
OB2223CP
SOP8, Pb-free, Tube
OB2223CPA
SOP8, Pb-free, T&R
OB2223AP
DIP8, Pb-free, Tube
OB2223
High Precision Low Cost MCM Power Switch
Package Dissipation Rating
Package
RθJA (/W)
SOP8
90
DIP8
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
TEL0755-82584090

No Preview Available !

Marking Information
OB2223
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
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
©On-Bright Electronics
Confidential
-3-
Preliminary Datasheet
TEL0755-82584090

No Preview Available !

BLOCK DIAGRAM
OB2223
High Precision Low Cost MCM Power Switch
©On-Bright Electronics
Confidential
-4-
Preliminary Datasheet
TEL0755-82584090

No Preview Available !

OB2223
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
45
f/Freq
Frequency shuffling range
F_shuffling
Shuffling frequency
F_Burst
Burst Mode
Frequency
Switch
PWM Section
Dmax
Maximum Duty Cycle
Vref_green
Threshold enter green
mode
Vref_burst_H Threshold exit burst mode
Vref_burst_L Threshold enter burst mode
Error Amplifier section
Gain
DC gain of EA
Gm Trans-conductance of EA
Protection Section
Typ
3
0.9
1.2
7.0
12.5
25
10
12.5
200
925
100
50
+/-6
200
22
50
1.75
1.35
1.25
70
110
Max
10
1.5
1.7
8.0
13.5
27
13
960
55
Unit
uA
mA
mA
V
V
V
V
V
ns
mV
ns
Kohm
KHz
%
Hz
KHZ
%
V
V
V
dB
uS
©On-Bright Electronics
Confidential
-5-
Preliminary Datasheet
TEL0755-82584090