DataSheet.es OB2201 Hoja de datos PDF


PDF OB2201 Datasheet ( Hoja de datos )

Número de pieza OB2201
Descripción High Performance Quasi-Resonant PWM Controller
Fabricantes On-Bright Electronics 
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OB2201 datasheet

1 Page

OB2201 pdf
OB2201
High Performance Quasi-Resonant PWM Controller
ELECTRICAL CHARACTERISTICS
(TA = 25OC, VCC=16V, RI=20K Ohm if not otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage Section (VCC Pin)
I_VCC_Startup VCC Start up Current
VCC =UVLO(OFF)-1.5V,
Measure current into VCC
-
5 15 uA
I_VCC_quiet
I_VCC_operation
Operation Current without
switching
Operation current with
switching
FB=3V
FB=3V,
GATE
-
1nF load at -
2.0 4.0 mA
3.0 5.0 mA
UVLO(ON)
UVLO(OFF)
VCC Under Voltage
Lockout Enter
VCC Under Voltage
Lockout Exit (Startup)
8.0 9.0 10.0 V
15 16 17 V
OVP(ON)
VCC Over Voltage
Protection Enter
28 V
VCC_Clamp
VCC Zener
Voltage
Clamp I_VCC = 5 mA
29 V
Feedback Input Section (FB Pin)
AVCS
PWM Input Gain
ΔVFB /ΔVcs
- 3.5 - V/V
VFB_Open
FB Open Voltage
-- 5.3 -- V
IFB_Short
VTH_BM_on
VTH_BM_off
VTH_PL
FB pin short circuit
current
Burst Mode on threshold
Burst Mode off threshold
Power Limiting FB
Threshold Voltage
Short FB pin to GND,
measure current
--
-
-
-
1.5 -
0.8 -
0.7 -
4.4 -
mA
V
V
V
TD_PL
Power limiting Debounce
Time
ZFB_IN
Input Impedance
Current Sense Input Section (CS Pin)
T_blanking
CS Input Leading Edge
Blanking Time
-- 80 -- ms
- 4 - Kohm
- 300 - ns
VTH_OCP_zero_
ontime
VTH_OCP_max
Internal current
threshold
Internal current
threshold
limiting
limiting
Zero duty cycle
Maximum duty cycle
0.41
5
0.45
0.48
5
V
- 0.80 - V
VTH_CS_min
Flodback mode and burst
mode CS peak
0.3 V
TD_OC
Over Current Detection
and Control Delay
CL=1nf at GATE,
- 100 -- ns
Demagnetization Detection Section (DEM Pin)
Demagnetization
VTH_DEM
comparator threshold
voltage
-- 75 -- mV
VDEM_clamp(neg)
VDEM_clamp(pos)
Tsupp
TOUT
TDEM_delay
Negative clamp voltage
Positive clamp voltage
Suppression of the
transformer ringing at
start of secondary stroke
Timeout after last demag
transistion
Demag propagation delay
- -0.7 - V
- 6.0 - V
-- 2.5 -- us
-- 5 -- us
- 250 - ns
©On-Bright Electronics
Confidential
-5-
Datasheet
OB_DOC_DS_2201A1

5 Page

OB2201 arduino
OB2201
High Performance Quasi-Resonant PWM Controller
lies in the range of ±4% of 52K Hz. When the
system leaves fix frequency CCM mode, the
frequency shuffling and slope compensation will
automatically disappear.
z Output Over Voltage Protection (OVP)
An output over voltage protection (OVP) is
implemented by sensing the auxiliary winding
voltage at DEM pin during the flyback phase. The
auxiliary winding voltage is a well-defined replica
of the output voltage. The OVP works by sampling
the plateau voltage at DEM pin during the flyback
phase. Internal 2.5us delay (plateau sensing)
guarantees a clean plateau, provided that the
leakage inductance ringing has been fully damped.
Auxiliary
winding
R1
8
R2 DEM
OB2201
Plateau
Sampling
3.75V
Lasts for 4
subsequent cycles
Yes
Figure 4
True OVP
If the sampled plateau voltage exceeds the OVP
trip level (3.75V), an internal counter starts
counting subsequent OVP events. If OVP events
are detected in successive 4 cycles, the controller
assumes a true OVP and it enters a latch off
mode and stops all switching operations. The
counter has been added to prevent incorrect OVP
detection which might occur during ESD or
lightning events. If the output voltage exceeds the
OVP trip level less than 4 successive cycles, the
internal counter will be cleared and no fault is
asserted.
z Over Load Protection
When over load (for example, short circuit) occurs,
the feedback current of photo coupler is below
minimum value, FB pin voltage approaches its
floating pin voltage, then a fault is detected. If this
fault is present for more than 80ms, the controller
enters an auto-recovery soft burst mode. All
pulses are stopped, VCC will drops below UVLO
and the controller will try to restart with the power
on soft start. It resumes operation once the fault
disappears.
z Over Temperature Protection with latch
shutdown
A NTC resistor in series with a regular resistor
should be connected between RT and GND for
temperature sensing and protection. NTC resistor
value becomes lower when the ambient
temperature rises. A resistor between RI and
GND sets internal reference current and the timer.
The relationship between RT source current and
RI resistor fellows below equation:
I_RT = 100* 20K ( uA ),
RI
With 20K Ohm RI selected, an internal 100uA
current flows through the NTC resistors. The
voltage at RT pin becomes lower at high
temperature. The internal OTP circuit is triggered
and shuts down the MOSFET when the sensed
input voltage is lower than 1.05V. OTP is a
latched shutdown.
z Pin Floating and Short Protection
OB2201 provides pin floating protection for RI, CS,
FB, DEM, etc., and RI pin short protection. In
cases when the pin are floating or RI pin is
shorted to ground, Gate switching is disabled,
thus protect the power system.
z External latch trip point
By externally forcing a level on pin RT (e.g.., with
a signal coming from a temperature sensor) less
than 1.05V, OB2201 can be permanently latched-
off. To resume normal operation, VCC voltage
should go below 6V (typical), which implies to
unplug the SMPS from the mains.
z Gate Drive
The Gate pin is connected to the gate of an
external QR power switch with 0.8A capability. An
internal 16.5V clamp is added for MOSFET gate
protection at high VCC voltage. When VCC
voltage drops below UVLO(ON), the Gate pin is
internally pull low to maintain the off state.
©On-Bright Electronics
Confidential
- 10 -
Datasheet
OB_DOC_DS_2201A1

10 Page





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