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PDF OB2269C Data sheet ( Hoja de datos )
| Número de pieza | OB2269C | |
| Descripción | Current Mode PWM Controller | |
| Fabricantes | On-Bright Electronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OB2269C (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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OB2269C
GENERAL DESCRIPTION
OB2269C 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
externally programmable and 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.
VDD low startup current and low operating current
contribute to a reliable power on startup design with
OB2269C. A large value resistor could thus be used
in the startup circuit to minimize the standby power.
The internal slope compensation improves system
large signal stability and reduces the possible sub-
harmonic oscillation at high PWM duty cycle output.
Leading-edge blanking on current sense input
removes the signal glitch due to snubber circuit diode
reverse recovery. This greatly helps to reduce the
external component count and system cost in
application.
OB2269C offers complete protection coverage with
automatic self-recovery feature including Cycle-by-
Cycle current limiting (OCP), over load protection
(OLP), over temperature protection (OTP), VDD
over voltage protection (OVP) and under voltage
lockout (UVLO). The Gate-drive output is clamped
at 18V to protect the power MOSFET.
In OB2269C, OCP threshold slope is internally
optimized to reach constant output power limit over
universal AC input range.
Excellent EMI performance is achieved with On-
Bright proprietary frequency shuffling technique
together with soft switching control at the totem pole
gate drive output.
TYPICAL APPLICATION
Frequency Shuffling
The tone energy at below 20KHZ is minimized in
operation. Consequently, audio noise performance is
greatly improved.
OB2269C is offered in both SOP-8 and DIP-8
packages.
FEATURES
■ On-Bright Proprietary Frequency Shuffling
Technology for Improved EMI Performance
■ Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power Design
■ Audio Noise Free Operation
■ External Programmable PWM Switching
Frequency
■ Internal Synchronized Slope Compensation
■ Low VIN/VDD Startup Current(6.5uA) and Low
Operating Current (2.3mA)
■ Leading Edge Blanking on Current Sense Input
■ Complete Protection Coverage With Auto Self-
Recovery
o External Programmable Over Temperature
Protection (OTP)
o With or Without On-chip VDD OVP for
System OVP
o Under Voltage Lockout with Hysteresis
(UVLO)
o Gate Output Maximum Voltage Clamp (18V)
o Line Compensated Cycle-by-Cycle Over-
current Threshold Setting For Constant Output
Current Limiting Over Universal Input Voltage
Range (OCP)
o Over Load Protection. (OLP)
APPLICATIONS
Offline AC/DC flyback converter for
■
■ PC/TV/Set-Top Box Power Supplies
■ Open-frame SMPS
■ Battery Charger
©On-Bright Electronics
-1-
Confidential
OB_DOC_DS_69CC1
1 page  
OB2269C
Current Mode PWM ControllerFrequency Shuffling
ESD INFORMATION
Symbol
HBMNote
MM
Parameter
Human Body Model
on All Pins Except
VIN and VDD
Machine Model on
All Pins
Test Conditions
MIL-STD
JEDEC-STD
Min Typ Max Unit
3 KV
250 V
Note: HBM all pins pass 3KV except High Voltage Input pin. The details are VIN passes 1kV, VDD passes 1.5KV, all other I/Os pass 3KV.
In system application, High Voltage Input pin is either a high impedance input or connected to a cap. The lower rating has minimum impacts
on system ESD performance.
ELECTRICAL CHARACTERISTICS
(TA = 25OC, VDD=16V, RI=24Kohm if not otherwise noted)
Symbol
Parameter
Test Conditions
Supply Voltage (VDD)
I_VDD_Startup VDD Start up
Current
I_VDD_Operation Operation Current
UVLO(Enter)
VDD Under Voltage
Lockout Enter
UVLO(Exit)
VDD Under Voltage
Lockout Exit
(Startup)
OVP(ON)*Optional VDD Over Voltage
Protection Enter
OVP(OFF)*Optional VDD Over Voltage
Protection Exit
(Recovery)
OVP_Hys*Optional OVP Hysteresis
TD_OVP
VDD OVP
Debounce time
VDD_Clamp
VDD Zener Clamp
Voltage
VDD =15V, Measure
current into VDD
VFB=3V
OVP(ON)-OVP(OFF)
I(VDD ) = 5mA
Feedback Input Section(FB Pin)
AVCS
PWM Input Gain
VFB_Open
VFB Open Voltage
ΔVFB /ΔVcs
IFB_Short
FB pin short circuit
current
VTH_0D
Zero Duty Cycle FB
Threshold Voltage
VTH_BM
Burst Mode FB
Threshold Voltage
VTH_PL
Power Limiting FB
Threshold Voltage
TD_PL
Power limiting
Debounce Time
ZFB_IN
Input Impedance
Current Sense Input(Sense Pin)
T_blanking
Sense Input Leading
Edge Blanking Time
ZSENSE_IN
Sense Input
Short FB pin to GND,
measure current
Min Typ Max Unit
6.5 20 uA
2.3 mA
9.5 10.5 11.5 V
15.5 16.5 17.5 V
23.5 25
21.5 23
26.5 V
24.5 V
2V
80 uSec
35 V
2.8 V/V
5.9 V
0.80 mA
0.95 V
1.7 V
4.4 V
80 mSec
7.2 Kohm
250 nS
30 Kohm
©On-Bright Electronics
-5-
Confidential
OB_DOC_DS_69CC1
5 Page 
PACKAGE MECHANICAL DATA
8-Pin Plastic DIP
OB2269C
Current Mode PWM ControllerFrequency Shuffling
©On-Bright Electronics
- 11 -
Confidential
OB_DOC_DS_69CC1
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet OB2269C.PDF ] | |
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