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OB2283 Schematic ( PDF Datasheet ) - On-Bright Electronics

Teilenummer OB2283
Beschreibung High Performance Current Mode PWM Controller
Hersteller On-Bright Electronics
Logo On-Bright Electronics Logo 




Gesamt 11 Seiten
OB2283 Datasheet, Funktion
OB2283
High Performance Current Mode PWM Controller
GENERAL DESCRIPTION
OB2283 is a highly integrated current mode PWM
control IC optimized for high performance, low
standby power and cost effective offline flyback
converter applications.
PWM switching frequency at normal operation is
internally fixed and is trimmed to tight range. At no
load or light load condition, the IC operates in
extended ‘burst mode’ to minimize switching loss.
Lower standby power and higher conversion
efficiency is thus achieved.
VCC low startup current and low operating current
contribute to a reliable power on startup and low
standby design with OB2283.
OB2283 offers comprehensive protection
coverage with auto-recovery including Cycle-by-
Cycle current limiting (OCP), over load protection
(OLP), and VCC under voltage lockout (UVLO). It
also provides the protections with latched shut
down including over temperature protection (OTP),
and over voltage protection (OVP). Excellent EMI
performance is achieved with On-Bright
proprietary frequency shuffling technique.
The tone energy at below 25KHz is minimized in
the design and audio noise is eliminated during
operation.
OB2283 is offered in SOT23-6 package.
APPLICATIONS
Offline AC/DC flyback converter for
Printer, Storage power supply
Power Adapter
FEATURES
Power on soft start reducing MOSFET Vds
stress
Frequency shuffling for EMI
Extended burst mode control for improved
efficiency and low standby power design
Audio noise free operation
Peak load operation with increased frequency
Comprehensive protection coverage
o VCC Under Voltage Lockout with
hysteresis (UVLO)
o VCC Over Voltage Protection (VCC OVP)
o Cycle-by-cycle over current threshold
setting for constant output power limiting
over universal input voltage range
o Over Load Protection (OLP) with auto-
recovery
o External (if NTC resistor is connected at
PRT pin)or internal Over Temperature
Protection (OTP) with latched shut down
o Output Over Voltage Protection(Output
OVP) with latched shut down, and the
OVP triggered voltage can be adjusted by
the resistor connected between auxiliary
winding and PRT pin
o Output diode short protection with auto-
recovery
o GND open protection with auto-recovery
TYPICAL APPLICATION
AC IN
EMI
Filter
OB2283
6 FB VCC 1
5 PRT
CS 2
4 GND GATE 3
Vaux
DC
Out
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_228300






OB2283 Datasheet, Funktion
Vgnd_open
Td_gnd_open
Td_OCP
PRT pin
IRT
VOTP
Td_OTP
Ioutput_ovp
Td_output_ovp
In-chip OTP
OTP enter
OTP exit
Oscillator
FOSC
Fosc_PK
SST_freq
f_OSC
F_shuffling
f_Temp
f_VCC
F_Burst
Gate driver
VOL
VOH
V_clamping
T_r
T_f
OB2283
High Performance Current Mode PWM Controller
GND open protection voltage
difference between GND and
CS
GND
open
debounce time
protection
Over Current protection
debounce Time
0.3 V
20 us
60 ms
Output current for external OTP
detection
Threshold voltage for external
OTP
External OTP debounce time
Current threshold for adjustable
output OVP
Output OVP debounce time
95 100 105 uA
0.95 1
5
70
5
1.05 V
Cycles
uA
Cycles
150
120
Normal Oscillation Frequency
VDD=18V,FB=3V,
CS=0V
Peak frequency
VDD=18V,FB=4.5V,
CS=0V
Soft start time of frequency
Frequency jittering
Shuffling frequency
Frequency
Stability
Temperature
Frequency Voltage Stability
Burst Mode Switch Frequency
60 65 70
142
30
+/-6
32
1
1
25
KHz
KHz
ms
%
Hz
%
%
KHz
Output low level @ VDD=18V,
Io=5mA
Output high level @ VCC=18V,
Io=20mA
Output clamp voltage
Output rising time 1.2V ~ 10.8V
@ CL=1000pF
Output falling time 10.8V ~ 1.2V
@ CL=1000pF
1
6
12
160
50
V
V
V
ns
ns
©On-Bright Electronics
Confidential
-6-
Preliminary Datasheet
OB_DOC_DS_228300

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