DatasheetQ Logo
Electronic component search and free download site.
Transistors,MosFET ,Diode,Integrated circuits

OB5269CP View Datasheet(PDF) - On-Bright Electronics

Part Name
Description
Manufacturer
OB5269CP
On-Bright
On-Bright Electronics  On-Bright
OB5269CP Datasheet PDF : 11 Pages
1 2 3 4 5 6 7 8 9 10
OB5269
High Voltage Green Mode PWM Controller
A good tradeoff is achieved through the built-in
Current Sensing and Leading Edge Blanking totem pole gate design with right output strength
Cycle-by-Cycle current limiting is offered in and dead time control. The low idle loss and good
OB5269 current mode PWM control. The EMI system design is achieved with this dedicated
switching current is detected by a sense resistor control scheme.
connected to the CS pin. An internal leading edge
blanking circuit chops off the sensed voltage
spikes due to snubber diode reverse recovery and
surge gate current of power MOSFET at initial
internal power MOSFET on state. The current
limiting comparator is disabled and cannot turn off
the internal power MOSFET during the blanking
period. The PWM duty cycle is determined by the
current sense input voltage and the FB input
Ktec Protection Controls
Good power supply system reliability is achieved
with auto-recovery protection features including
Cycle-by-Cycle current limiting (OCP), Over Load
Protection (OLP), and Under Voltage Lockout on
VDD (UVLO), and latched shutdown features
including over temperature protection (OTP) and
VDD over voltage protection (OVP).
voltage.
Internal Synchronized Slope Compensation
to Built-in slope compensation circuit adds voltage
ramp onto the current sense input voltage for
PWM generation. This greatly improves the close
l loop stability at CCM and eliminates the sub-
harmonic oscillation and thus reduces the output
tia ripple voltage.
Driver
n The power MOSFET is driven by a dedicated gate
driver for power switching control. Too weak gate
e driver results in higher conduction and switch loss
of MOSFET while too strong gate driver results
On-Bright Confid the compromise of EMI.
With On-Bright proprietary technology, the OCP is
line voltage compensated to achieve constant
output power limit over the universal input voltage
range.
At overload condition when FB input voltage
exceeds power limit threshold value for more than
TD_PL, control circuit shuts down the converter. It
restarts when VDD voltage drops below
Vth_recovery. For protection with latched shut
down mode, control circuit shutdowns (latch) the
power MOSFET when an Over Temperature
condition or Over Voltage condition is detected
until VDD drops below Vth_latch , and device
enters power on restart-up sequence thereafter.
©On-Bright Electronics
Confidential
-9-
Preliminary Datasheet
OB_DOC_DS_526902
 

Share Link: 

datasheetq.com  [ Privacy Policy ]Request Datasheet ] [ Contact Us ]