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OB3613 데이터시트 PDF




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부품번호 OB3613 기능
기능 High PF Non-Isolated Buck LED Lighting Controller
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OB3613 데이터시트, 핀배열, 회로
OB3613
High PF Non-Isolated Buck LED Lighting Controller
GENERAL DESCRIPTION
OB3613 is a high power factor, highly integrated
buck regulator with advanced features to provide
high efficiency control and high precision constant
current output for LED lighting applications.
The proprietary CC control scheme is used and
the system can achieve high power factor with
constant on-time control scheme.
OB3613 offers comprehensive protection
coverage with auto-recovery features including
LED open loop protection, LED short circuit
protection, cycle-by-cycle current limiting, built-in
leading edge blanking, VDD under voltage lockout
(UVLO), etc.
OB3613 is offered in SOT23-6 package.
FEATURES
Buck topology with high power factor
High precision constant current regulation at
universal AC input
Low system cost and high efficiency
Quasi-Resonant operation
Programmable CC regulation
LED short circuit protection
LED open loop protection
Cycle-by-cycle current limiting
Built-in leading edge blanking (LEB)
VDD under voltage lockout with hysteresis
VDD over voltage protection
Over temperature protection (OTP)
APPLICATIONS
LED lighting
TYPICAL APPLICATION
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_361300




OB3613 pdf, 반도체, 판매, 대치품
BLOCK DIAGRAM
OB3613
High PF Non-Isolated Buck LED Lighting Controller
©On-Bright Electronics
Confidential
-4-
Preliminary Datasheet
OB_DOC_DS_361300

4페이지










OB3613 전자부품, 판매, 대치품
OB3613
High PF Non-Isolated Buck LED Lighting Controller
OPERATION DESCRIPTION
OB3613 is a high power factor, highly integrated
buck regulator with advanced features to provide
high efficiency control and high precision constant
current output for LED lighting applications.
Start up Control
Low start-up current is designed in OB3613 so that
VDD could be charged up above UVLO threshold
with small charging current. A large value startup
resistor can therefore be used to minimize the
power loss in application.
The capacitor at COMP pin is pulled up quickly
during starting up until its voltage reaches 1.2V.
Then the error amplifier charges the COMP pin
capacitor with a transconductance of about 500uS
(typical), and the Gate drives external power
MOSFET at minimum frequency for low power
dissipation. At the startup, the threshold voltage of
OCP is set at 0.5V (typical). When the voltage at
FB pin reaches 0.45V (typical), the threshold
voltage of OCP is increased to 1V (typical). When
the voltage at FB pin increases and reaches 1.2V
(typical), the transconductance of error amplifier is
reduced to 50uS (typical).
LED Constant Current Regulation
OB3613 uses the constant current control method
to accurately control the LED current. It detects
LED current and forces the average LED current
equals to the ratio of reference voltage to
resistance at CS pin as shown in the equation
below.
I LED
Vref
R CS
Rcs — The sensing resistor connected between
the MOSFET source and the GND pin of IC.
Vref — Internal reference voltage.
PFC
The duration of the turn on period ton is generated
by comparing an internal fixed saw-tooth wave
with the voltage on the COMP pin. During steady
state operation, the voltage on the COMP pin
Vcomp is slowly varying due to a large external
capacitor connected at the COMP pin, therefore
the turn on time ton is constant. In a buck topology,
constant turn on time.
Current Sensing and Leading Edge
Blanking
Cycle-by-Cycle current limiting (OCP) is offered in
OB3613. The switching current is detected by a
sense resistor connected between the CS pin and
GND. An internal leading edge blanking circuit
chops off the sense voltage spike at initial
MOSFET on state due to wheel diode reverse
recovery so that the external RC filter is no longer
required. The current limit comparator is disabled
at this blanking time and thus the external
MOSFET cannot be turned off during this blanking
time.
LED Open/Output OVP Protection
When LED string is open, an output over-voltage
condition is monitored independently by the
voltage at pin FB. During normal operation, when
the voltage at FB pin exceeds a threshold of
approximately 3.5V (typical), the over-voltage
protection function is activated and the GATE is
turned off immediately until VDD voltage drops
below UVLO (ON), and the device enters power
on startup sequence thereafter.
VDD Over Voltage Protection
VDD is supplied from the BUCK output as shown
in the typical application diagram. When VDD is
higher than 35V (typical), VDD OVP protection is
triggered and GATE is shut down, and the device
enters power on startup sequence thereafter.
LED Short Circuit Protection
When LED string is short, the voltage at FB pin
drops to below a threshold of approximately 0.45V
(typical), the IC will work at minimum frequency
and the threshold voltage of OCP is reduced to
0.5V (typical). The power dissipation is greatly
reduced in this way. When the VDD voltage drops
to UVLO(ON), the device enters power on startup
sequence thereafter.
Gate Driver
The GATE pin is connected to the gate of an
external power switch. An internal 12V (typical)
clamp is added for MOSFET gate protection at
high VDD voltage. When VDD voltage drops below
UVLO(ON), the GATE pin is internally pulled low to
maintain the off state.
©On-Bright Electronics
Confidential
-7-
Preliminary Datasheet
OB_DOC_DS_361300

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