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PDF OB2212 Datasheet ( Hoja de datos )

Número de pieza OB2212
Descripción Primary-Side Regulation PWM Power Switch
Fabricantes On-Bright 
Logotipo On-Bright Logotipo

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OB2212 Hoja de datos, Descripción, Manual
OB2211/OB2212
Primary-Side Regulation PWM Power Switch
GENERAL DESCRIPTION
OB2211/OB2212 is an offline PWM Power switch
for low power AC/DC charger and adaptor
applications. It operates in primary-side sensing and
regulation. Consequently, opto-coupler and TL431
could be eliminated from design. Proprietary
Constant Voltage (CV) and Constant Current (CC)
control is integrated as shown in the figure below.
In CC control, the current and output power setting
can be adjusted externally by the sense resistor Rs at
CS pin. In CV control, multi-mode operations are
utilized to achieve high performance and high
efficiency. Device operates in fixed frequency mode
at large load conditions, frequency reduction mode at
light/medium load and ‘Extended burst mode’ at
No/light load conditions.
OB2211/OB2212 offers power on soft start control
and complete protection coverage with auto-recovery
features including Cycle-by-Cycle current limiting,
VDD over-voltage clamp and UVLO, fail-safe
protection for open loop fault condition. Excellent
EMI performance is achieved with On-Bright
proprietary frequency shuffling technique together
with soft switching control at the totem pole gate
drive output with No-Y cap design.
FEATURES
„ Primary-side Sensing and Regulation With No
TL431 and Opto-coupler
„ Multi-mode Operation for High Efficiency
„ Programmable CV and CC Regulation
„ Adjustable Constant Current and Output Power
setting
„ Frequency Shuffling and Adjustable Gate Drive
Greatly Improving EMI
„ Power on Soft-start Time (4ms)
„ “Extended Burst Mode Control” for Improved
Efficiency and Minimum Standby Design
„ Built-in Leading Edge Blanking (LEB)
„ Cycle-by-Cycle Current Limiting
„ VDD Under Voltage Lockout with Hysteresis
(UVLO)
„ VDD Over Voltage Shutdown and Clamp
„ Auto-restart in Over Voltage condition
„ Fail-safe protection for open loop fault condition
APPLICATIONS
Low Power AC/DC offline SMPS for
„ Cell Phone Charger
„ Digital Cameras Charger
„ Small Power Adaptor
„ Auxiliary Power for PC, TV etc.
„ Linear Regulator/RCC Replacement
OB2211 is offered in SOP8 package.
OB2212 is offered in DIP8 package
Fig 1. Typical CC/CV Curve
TYPICAL APPLICATION
©On-Bright Electronics
On-Bright Confidential to MicroBridge
-1-
OB_DOC_DS_1100

1 page

OB2212 pdf
OB2211/OB2212
Primary-Side Regulation PWM Power Switch
ELECTRICAL CHARACTERISTICS
(TA = 25OC, VDD=VDDG=16V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Min Typ Max Unit
Supply Voltage (VDD) Section
I DD ST
Standby current
VDD=13V
5 10
I DD op
Operation Current
Operation supply current
INV=1.25V, CS=0V, -
VDD=VDDG=20V
1.0 2.0
UVLO(ON)
VDD Under Voltage
Lockout Enter
7.5 8.5 9.5
UVLO(OFF)
VDD Under Voltage
Lockout Exit
14.0 15 16.0
OVP(ON)
Over voltage protection
voltage
CS=0V,INV=1V
Ramp up VDD until
gate clock is off
28.5
30.0
31.5
VDD_clamp
IDD=10mA
33
Current Sense Input Section
TLEB
LEB time
540
Vth_oc
Td_oc
V TH_OC_test
Propagation delay
780 820 860
300
ZSENSE_IN
T_ss
Input Impedance
Soft start time
50
4
uA
mA
V
V
V
V
ns
mV
ns
Kohm
ms
CV Section
Freq
Freq_Burst
f/Freq
Normal mode frequency
Burst Mode Base
Frequency
Frequency shuffling range
45 50 55
22
+/-4
KHz
KHz
%
CC Section
Freq
Oscillation Frequency
Minimum frequency
Maximum frequency
12
50
KHz
KHz
Error Amplifier section
Vref_EA
Reference voltage for EA
Gdc DC gain of the EA
GBW
Unity gain bandwidth
1.21 1.25 1.29
50
37.5
V
dB
kHz
Power MOSFET Section
BVdss
Mos Drain-Source
Breakdown Voltage
RDS(on)
Static Drain to Source On OB2211
Resistance
OB2212
650
12 15
10 12
V
Ώ
©On-Bright Electronics
On-Bright Confidential to MicroBridge
-5-
OB_DOC_DS_1100

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