DataSheet.es OB2269C Hoja de datos PDF



PDF OB2269C Datasheet ( Hoja de datos )

Número de pieza OB2269C
Descripción Current Mode PWM Controller
Fabricantes On-Bright Electronics 
Logotipo On-Bright Electronics Logotipo
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OB2269C datasheet

1 Page

OB2269C pdf
OB2269C
Current Mode PWM ControllerFrequency Shuffling
ESD INFORMATION
Symbol
HBMNote
MM
Parameter
Human Body Model
on All Pins Except
VIN and VDD
Machine Model on
All Pins
Test Conditions
MIL-STD
JEDEC-STD
Min Typ Max Unit
3 KV
250 V
Note: HBM all pins pass 3KV except High Voltage Input pin. The details are VIN passes 1kV, VDD passes 1.5KV, all other I/Os pass 3KV.
In system application, High Voltage Input pin is either a high impedance input or connected to a cap. The lower rating has minimum impacts
on system ESD performance.
ELECTRICAL CHARACTERISTICS
(TA = 25OC, VDD=16V, RI=24Kohm if not otherwise noted)
Symbol
Parameter
Test Conditions
Supply Voltage (VDD)
I_VDD_Startup VDD Start up
Current
I_VDD_Operation Operation Current
UVLO(Enter)
VDD Under Voltage
Lockout Enter
UVLO(Exit)
VDD Under Voltage
Lockout Exit
(Startup)
OVP(ON)*Optional VDD Over Voltage
Protection Enter
OVP(OFF)*Optional VDD Over Voltage
Protection Exit
(Recovery)
OVP_Hys*Optional OVP Hysteresis
TD_OVP
VDD OVP
Debounce time
VDD_Clamp
VDD Zener Clamp
Voltage
VDD =15V, Measure
current into VDD
VFB=3V
OVP(ON)-OVP(OFF)
I(VDD ) = 5mA
Feedback Input Section(FB Pin)
AVCS
PWM Input Gain
VFB_Open
VFB Open Voltage
ΔVFB /ΔVcs
IFB_Short
FB pin short circuit
current
VTH_0D
Zero Duty Cycle FB
Threshold Voltage
VTH_BM
Burst Mode FB
Threshold Voltage
VTH_PL
Power Limiting FB
Threshold Voltage
TD_PL
Power limiting
Debounce Time
ZFB_IN
Input Impedance
Current Sense Input(Sense Pin)
T_blanking
Sense Input Leading
Edge Blanking Time
ZSENSE_IN
Sense Input
Short FB pin to GND,
measure current
Min Typ Max Unit
6.5 20 uA
2.3 mA
9.5 10.5 11.5 V
15.5 16.5 17.5 V
23.5 25
21.5 23
26.5 V
24.5 V
2V
80 uSec
35 V
2.8 V/V
5.9 V
0.80 mA
0.95 V
1.7 V
4.4 V
80 mSec
7.2 Kohm
250 nS
30 Kohm
©On-Bright Electronics
-5-
Confidential
OB_DOC_DS_69CC1

5 Page

OB2269C arduino
OB2269C
Current Mode PWM ControllerFrequency Shuffling
OB2269C Gate 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 while too
strong gate drive output compromises the 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 easier to achieve
with this dedicated control scheme. An internal
18V clamp is added for MOSFET gate protection at
higher than expected VDD input.
z Protection Controls
Good system reliability is achieved with
OB2269C’s rich protection features including
Cycle-by-Cycle current limiting (OCP), Over Load
Protection (OLP), over temperature protection
(OTP), on-chip VDD over voltage protection (OVP,
optional) and under voltage lockout (UVLO).
The OCP threshold value is self adjusted lower at
higher current into VIN pin. This OCP threshold
slope adjustment helps to compensate the increased
output power limit at higher AC voltage caused by
inherent Over-Current sensing and control delay. A
constant output power limit is achieved with
recommended OCP compensation scheme on
OB2269C.
At output overload condition, FB voltage is biased
higher. When FB input exceeds power limit
threshold value for more than 80mS, control circuit
reacts to turnoff the power MOSFET.
Similarly, control circuit shutdowns the power
MOSFET when an Over Temperature condition is
detected. OB2269C resumes the operation when
temperature drops below the hysteresis value.
VDD is supplied with transformer auxiliary
winding output. It is clamped when VDD is higher
than 35V. MOSFET is shut down when VDD drops
below UVLO(enter) limit and device enters power
on startup sequence thereafter.
©On-Bright Electronics
- 10 -
Confidential
OB_DOC_DS_69CC1

10 Page





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