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Número de pieza OB2203
Descripción Quasi-Resonant Flyback PWM Controller
Fabricantes On-Bright Electronics 
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OB2203 datasheet

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OB2203 pdf
OB2203
Quasi-Resonant Flyback PWM Controller
ELECTRICAL CHARACTERISTICS
(TA = 25OC, VCC=16V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage (VCC) Section
I_VCC_Startup VCC Start up Current VCC =13.5V, Measure
-
5
15 uA
current into VCC
I_VCC_quiet
Operation Current
without switching
FB=3V, CS is floating, -
2.0 3.0 mA
I_VCC_operation Operation current
with switching
FB=3V, Fsw=40KHz, 1nF -
load at GATE
3.0 4.0 mA
UVLO(ON)
VCC Under Voltage
Lockout Enter
7.5 8.5 9.5 V
UVLO(OFF)
VCC Under Voltage
Lockout Exit
(Startup)
14 15 16 V
OVP(ON)
VCC Over Voltage
Protection Enter
29 31 33 V
VCC_Clamp
VCC Zener Clamp
Voltage
I(VCC ) = 5 mA
30 32 34 V
Feedback Input Section(FB Pin)
AVCS
PWM Input Gain
VFB_Open
FB Open Voltage
ΔVFB /ΔVcs
- 3.5 - V/V
4.8 5.3 6.0 V
IFB_Short
FB pin short circuit
current
VTH_0D
Zero Duty Cycle FB
Threshold Voltage
VTH_PFM_H
PFM mode up
threshold
VTH_PFM_L
PFM mode down
threshold
VTH_BM_on
Burst Mode on
threshold
VTH_BM_off
Burst Mode off
threshold
VTH_PFC_GTS
Threshold for PFC to
go to standby
VTH_PFC_on
Threshold for PFC to
leave standby mode
VTH_PL
Power Limiting FB
Threshold Voltage
TD_PL
Power limiting
Debounce Time
ZFB_IN
Input Impedance
Current Sense Input(CS Pin) Section
T_blanking
CS Input Leading
Edge Blanking Time
VTH_OC_0
Internal current
limiting threshold
VTH_OC_60%
Internal current
limiting threshold
TD_OC
Over Current
Short FB pin to GND,
measure current
Zero duty cycle
60% duty cycle
CL=1nf at GATE,
1.0 1.5 -
mA
0.95 V
1.45 V
1.0 V
1.0 V
0.9 V
1.35 V
1.45 V
4.4 V
60 80 120 mSec
4 Kohm
350 nSec
0.43 0.45 0.47 V
0.80 V
100 160 nSec
©On-Bright Electronics
-5-
Confidential
OB_DOC_DS_0300

5 Page

OB2203 arduino
OB2203
primary self inductance of the transformer and Cd
is the capacitance on the drain node.
Figure 2
The typical detection level is fixed at 75mV at the
DEM pin. Demagnetization is recognized by
detection of a possible “valley” when the voltage at
DEM is below 75mV in falling edge. DEM
detection is suppressed during the first Tsupp time
(typical value of 2us). This suppression is necessary
in applications where the transformer has a large
leakage inductance and at low output voltages or
start-up.
z Current Sensing and Leading Edge
Blanking
Cycle-by-Cycle current limiting is offered in
OB2203 current mode control. The switch current
is detected by a sense resistor into the CS pin. An
internal leading edge blanking circuit chops off the
sense voltage spike at initial MOSFET on state due
to snubber diode reverse recovery so that the
external RC filtering on sense input is no longer
needed. The current limit comparator is disabled
and cannot turn off the external MOSFET during
the blanking period. The PWM duty cycle is
determined by the current sense input voltage and
the FB input voltage.
z Adaptive Slope Compensation at Large
Load
The slop compensation to ensure system stable
operation is active only at large load condition. At
large load conditions (such as startup), the
switching frequency can be low clamped to 40KHz
and the system will actually work in CCM mode.
To prevent the possible unstable operation and the
sub-harmonic oscillation, an internal synchronized
slope compensation is added to the current loop.
The internal synchronized slope compensation is
disabled at normal or light load, in such condition,
the system will work in either QR or DCM mode.
Quasi-Resonant Flyback PWM Controller
z Maximum and Minimum On-Time
The minimum on-time of the system is determined
by the LEB time (typical 350ns). The IC limits the
on-time to a maximum time of 45us.
z Ringing Suppression Timer
A ringing suppression timer is implemented. In
normal operation, the ringing suppression timer
starts when CS reaches the feedback voltage FB,
the gate drive GATE is set to low. During the
ringing suppression time, gate drive GATE remains
in low state and cannot turn power switch on gain.
The ringing suppression is necessary in applications
where the transformer has a large leakage
inductance, particularly at low output voltages or
startup. In OB2203, the ringing suppression timer is
set to 2us internally.
z PFC VCC power on/off control
In medium to large power applications, PFC pre-
converter is required and PFC controller is powered
by PWM auxiliary power supply. PFCVCC pin is
directly connected to VCC pin by an internal low
impedance power switching, thus no external
components are needed. PFCVCC is shut down in
any of the following conditions: any fault condition,
No load/light load condition, soft start sequence
and VCC voltage less than 12V.
z Maximum and Minimum Frequency Clamp
in QR operation
According to the QR operation principle, the
switching frequency is inversely proportional to the
output power. Therefore, when the output power
decreases, the switching frequency can become
rather high without limiting. To meet the CISPR-22
EMI limit starting at 150KHz, the maximum
switching frequency in OB2203 is internally
limited to 130KHz. In addition to up clamping, the
switching frequency is also low clamped to 40KHz
in QR mode.
z On chip Thermal shutdown
OB2203 provides an on chip thermal shutdown.
The IC will stop switching when the junction
temperature exceeds the thermal shutdown
temperature, typically 140 °C. The IC resumes
normal operation when the junction temperature
decreased by 20 °C
z External latch trip point
By externally forcing a level on pin SS (e.g.., with a
signal coming from a temperature sensor) greater
than 3.8V, OB2203 can be permanently latched-off.
To resume normal operation, VCC voltage should
©On-Bright Electronics
- 10 -
Confidential
OB_DOC_DS_0300

10 Page





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