DataSheet.es OB2288 Hoja de datos PDF


PDF OB2288 Datasheet ( Hoja de datos )

Número de pieza OB2288
Descripción Highly Integrated Current Mode PWM Controller
Fabricantes On-Bright Electronics 
Logotipo On-Bright Electronics Logotipo
Vista previa
Total 13 Páginas
		
OB2288 datasheet

1 Page

OB2288 pdf
OB2288
Highly Integrated Current Mode PWM Controller
ELECTRICAL CHARACTERISTICS
(TA = 25OC, RI=20K ohm, VDD=16V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Supply Voltage (VDD) Section
I_VDD_Startup VDD Startup Current VDD =13.5V
I_VDD_Ops
UVLO(Enter)
Operation Current
VDD Under Voltage
Lockout Enter
VFB=3V
UVLO(Exit)
VDD Under Voltage
Lockout Exit
OVP
VDD Over Voltage
Protection
TD_OVP
VDD OVP Debounce
Time
VDD_De-Latch Latch Release
Voltage Threshold
I_VDD_Latch
VDD Current at
Latch Shutdown
VDD=8V
VDD_Clamp
VDD Zener Clamp
Voltage
I(VDD ) = 15 mA
T_Softstart
Soft Start Time
Feedback Input Section(FB Pin)
AVCS
PWM Input Gain
VFB_Open
FB Pin Open Voltage
ΔVFB /ΔVcs
VDD=18V
Min Typ Max Unit
5 20 uA
2.3 mA
8 9 10 V
14.2 15.2 16.2 V
26 28 30 V
100 uSec
6.5 V
45 uA
31 V
4 mSec
2.2 V/V
6V
IFB_max
FB Pin Maximum
Source Current
VDD=18V, Short FB pin
to GND.
1.1
VFB_TH
Zero Duty Cycle
Threshold Voltage
VDD=9.5V, Vsense=0V 0.9 1
VTH_BM
Burst Mode FB
Threshold Voltage
1.6
VTH_PL
Power Limiting FB
Threshold Voltage
4.4
TD_PL
Power Limiting
Debounce Time
250
ZFB_IN
Input Impedance
6
Current Sense Input(Sense Pin) Section
T_blanking
Sense Input Leading VDD=18V
Edge Blanking Time
300
VTH_OC
Internal Current
Limiting Comparator
Threshold
0.67 0.7
TD_OC
Propagation delay to CL=1nF at GATE
GATE
70
Oscillator Section
FOSC Normal Oscillation
Frequency
F(shuffle)/Fosc Frequency Shuffling
Range
60 65
-4
F_shuffle
f_Temp
Frequency Shuffling
Cycling Frequency
Frequency
Temperature Stability
-20oC to 100 oC
32
3
mA
1.1 V
V
V
mSec
Kohm
nSec
0.73 V
nSec
70 KHz
4%
Hz
%
©On-Bright Electronics
-5-
Confidential
OB_DOC_DS_8800
Free Datasheet http://www.datasheetlist.co

5 Page

OB2288 arduino
OB2288
Highly Integrated Current Mode PWM Controller
value. This could be achieved by unplugging/re-
plugging of AC source in AC start-up configuration.
z Brownout Protection
By monitoring the voltage level on pin BO during
normal operation, the controller protects the SMPS
against low main condition. When BO voltage level
falls below 1.05V, and if it lasts for about 50ms, the
controller stops pulsing until this level goes back
and the operation resumes. By adjusting the resistor
divider connected between the high input voltage
and this pin, start and stop levels are programmable.
z Restart Timer
In some special applications, such as LCDTV, the
power supply of PWM stage is provided by other
DC source and it is always on. The following
diagram shows an AC/DC part of the LCDTV. The
front end is a PFC stage, followed by a PWM stage.
A stand along standby converter provides the DC
power supply for both PWM and PFC stages.
In such conditions, for example, when the over
loading protection (OLP) occurs, PWM stage will
be latched of and it will not recover since it is
powered by the standby DC supply. OB2288
overcomes this shortcoming by an internal restart
timer. When OLP occurs, the timer begins counting.
When counting over, the OLP states will be cleared.
System tends to restart and auto-recover. If OLP
still exists, then another counting cycle begins. The
counting time in OB2288 is 1 second. Therefore,
the nominal operation of OLP is not disturbed.
z Pin Floating and Short Protection
OB2288 provides pin floating protection for RI,
SENSE, FB, etc., and RI pin short protection. In
cases when the pin are floating or RI pin is shorted
to ground, PWM switching is disabled, thus protect
the power system.
z Overload Operation
When over load (for example, short circuit) occurs,
a fault is detected. If this fault is present for more
than 250ms, OB2288 enters an auto-recovery soft
burst mode. All pulses are stopped, VDD will drops
below UVLO and the controller will try to restart,
with the power-on soft start. The SMPS resumes
operation if the fault has gone. Otherwise, a burst
sequence starts again.
z Soft Start
OB2288 features an internal 4ms soft start to soften
the constraints occurring in the power supply
during startup. It is activated during the power on
sequence. As soon as VDD reaches UVLO(exit),
the peak current is gradually increased from nearly
zero to the maximum clamping level 0.7V. The soft
start is also activated during OLP sequence. Every
restart attempt is followed by soft start.
z Gate Drive
The PWM output is connected to the Gate of an
external MOSFET for power switch control. Too
weak the gate drive strength results in higher
conduction and switch loss of MOSFET, on the
anther hand, too strong gate drive output will
compromise EMI.
Good tradeoff is achieved through the built-in
totem pole gate drive design with right output
strength and dead time control. The low idle loss
and good EMI system design is easy to be achieved
with this dedicated control scheme. An internal
17V clamp is added for MOSFET gate protection at
higher than expected VDD input.
©On-Bright Electronics
- 10 -
Confidential
OB_DOC_DS_8800
Free Datasheet http://www.datasheetlist.com/

10 Page





PáginasTotal 13 Páginas
PDF Descargar[ OB2288.PDF ]

Enlace url


Hoja de datos destacado

Número de piezaDescripciónFabricantes
OB2283High Performance Current Mode PWM ControllerOn-Bright Electronics
On-Bright Electronics
OB2287High Performance Current Mode PWM ControllerOn-Bright Electronics
On-Bright Electronics
OB2288Highly Integrated Current Mode PWM ControllerOn-Bright Electronics
On-Bright Electronics

Número de piezaDescripciónFabricantes
SSM2604

Low Power Audio Codec.

Analog Devices
Analog Devices
SLG3NB3331

32.768 kHz and MHz GreenCLK.

Silego
Silego
SLA6805M

High Voltage 3 phase Motor Driver IC.

Sanken
Sanken
SDC1742

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices
SDC1741

12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters.

Analog Devices
Analog Devices


DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares,
permitiéndote verlos en linea o descargarlos en PDF.


Index : 0  1  2  3  4  5  6  7  8  9  A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z


www.DataSheet.es    |   2018   |  Contacto  |  Buscar