OB2263.pdf 데이터시트 (총 4 페이지) - 파일 다운로드 OB2263 데이타시트 다운로드

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SMD Type
Current Mode PWM Controller
OB2263
( SOT-23-6 )
0.4+0.1
-0.1
Features
Audio Noise Free Operation
External Programmable PWM Switching Frequency
Internal Synchronized Slope Compensation
Low VDD Startup Current and Low Operating Current (1.4mA)
Leading Edge Blanking on Current Sense Input
Good Protection Coverage With Auto Self-Recovery
Gate Output Maximum Voltage Clamp (13V)
Overload Protection (OLP)
6 54
1 23
+0.01
-0.01
+0.2
-0.1
IC
Unit: mm
0.15 +0.02
-0.02
1.GND
2.FB
3.NC
4.SENSE
5.VDD
6.GATE
Block Diagram
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SMD Type
Current Mode PWM Controller
OB2263
Typical Applicattion
IC
OB2263
Terminal Assignments
Pin Name
GND
FB
NC
SENSE
VDD
GATE
I/O Description
P Ground
I Feedback input pin. The PWM duty cycle is determined by voltage level into this pin
and SENSE pin input.
I Current sense input pin. Connected to MOSFET current sensing resistor node.
P Chip DC power supply pin.
O Totem-pole gate drive output for the power MOSFET.
Absolute Maximum Ratings Ta = 25
Parameter
DC supply voltage
VDD Zener Clamp Voltage FB
VFB Input Voltage
VSENSE Input Voltage to Sense Pin
VCC DC clamp current
Thermal Resistance Junction to Ambient
Junction Temperature
Operating temperature
Storage Temperature Range
Symbol
VDD
VCC
VFB
VSENSE
ICC
RθJA
TJ
TOPT
Tstg
Rating
10 to 30
VDD_Clamp+0.1V
-0.3 to 7
-0.3 to 7
10
200
-20 to 150
-20 to 85
-55 to 160
Unit
V
mA
/W
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SMD Type
Current Mode PWM Controller
OB2263
Electrical Characteristics Ta = 25
Parameter
Turn on threshold Voltage
Turn-off threshold Voltage
Start up current
Operation Current
VCC Zener Clamp
VFB Open Loop Voltage
PWM input gain ΔVfb/ΔVcs
FB Pin Short Current
Zero Duty Cycle FB Threshold Voltage
Power limiting FB Threshold
Power limiting Debounce
Input Impedance
Maximum duty cycle
Leading edge Blanking Time
Input impedance
OCP control delay
OCP threshold
Normal Oscillation Frequency
Burst Mode Base Frequency
Frequency variation versus temp.
Deviation
Frequency variation versus VCC
Frequency Jittering
Shuffling Frequency
Output voltage Low
Output High Level
Output clamp voltage
Rising time
Falling time
Symbol
UVLO_ON
UVLO_OFF
I_VCC_ST
I_VCC_OP
VCC_Clamp
VFB_Open
Avcs
IFB_Short
VTH_0D
VTH_PL
TD_PL
ZFB_IN
Max_Duty
TLEB
ZCS
TD_OC
VTH_OC
Fosc
Fosc_BM
Test Conditions
VDD =12.5V
VDD=16V, VFB=3V
IVCC= 5 mA
ΔVFB /ΔVcs
FB Shorted to GND
VDD =16V
VDD=18V, FB=3V, CS=0
GATE with 1nF to GND
FB=3.3V
VDD = 16V
Δf_temp
VDD=16V,Ta = -20 to 85
Δf_VCC
Δf_OSC
F_shuffling
VOL
VOH
Vclamp
Tr
Tf
VCC = 12 to 25V
VCC = 16V, Io = -20mA
VDD = 16V, Io = 20 mA
VDD = 16V, CL = 1nf
VDD = 16V, CL = 1nf
IC
Min
7.5
13.5
0.75
60
Typ
8.5
14.5
1.4
34
4.8
2
0.4
3.7
47
6
75
330
40
120
0.8
22
Max
9.5
15.5
20
0.75
0.85
70
Unit
V
uA
mA
V
V/V
mA
V
mS
kΩ
%
nS
kΩ
nS
V
KHz
5
%
5
-3 3
65 Hz
0.8
10 V
13
200
ns
70
Marking
Marking
63**
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SMD Type
Current Mode PWM Controller
OB2263
Typical Characterisitics
IC
.
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