UC2843BG-D08-T Просмотр технического описания (PDF) - Unisonic Technologies
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UC2843BG-D08-T Datasheet PDF : 9 Pages
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UC2843B
LINEAR INTEGRATED CIRCUIT
ELECTRICAL CHARACTERISTICS (Cont.)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
OSCILLATOR SECTION
Frequency
Frequency Change with Voltage
TJ =25°C, RT =62kΩ, CT =1nF,
49
fOSC
Min =225 kHz, Max =275 kHz
TJ = Full range
48
ΔfOSC
ΔV
VCC = 12V ~ 25V
Frequency Change with
Temperature
ΔfOSC
ΔT
TJ = Full range
Oscillator Voltage Swing
VOSC
Peak to peak
Discharge Current
IDISC
TJ =25°C, RT/CT =2V
RT/CT =2V
7.8
7.5
ERROR-AMPLIFIER SECTION
Voltage Feedback Input
VFB
COMP =2.5V
2.45
Input Bias Current
II(BIAS)
Open Loop Voltage Gain
GVO
VOUT =2V~4V
65
Unity Gain Bandwidth
GBW
0.7
Power Supply Rejection Ratio
PSRR VCC =12V~25V
60
Output Sink Current
ISINK
VFB =2.7V, COMP=1.1V
2
Output Source Current
Output Voltage Swing High State
CURRENT-SENSE SECTION
ISOURCE VFB =2.3V, COMP =5V
-0.5
VOH
VFB =2.3V, RL =15kΩ to GND
5
VOL
VFB =2.7V, RL =15kΩ to GND
Current Sense Input Voltage Gain
GV
(Note 2,3)
2.85
Maximum Current Sense Input
Threshold
VTH
COMP =5V (Note 2)
0.9
Power Supply Rejection Ratio
PSRR VCC =12V~25V (Note 2)
Input Bias Current
II(BIAS)
Propagation Delay
OUTPUT SECTION
tD
VFB =0V~2V
High-Level Output Voltage
VOH
IOH =-20mA
IOH =-200mA
13
12
Low-Level Output Voltage
VOL
IOL =20mA
IOL =200mA
Under-Voltage Lockout
Output Voltage
VUVLO
VCC =5V, IOL=1mA
Output Voltage Rise Time
tR
Output Voltage Fall Time
tF
UNDERVOLTAGE-LOCKOUT SECTION
CL =1nF, TJ = 25°C
CL =1nF, TJ = 25°C
Startup Threshold
VTH
7.8
Minimum Operating Voltage
After Start-Up
VCC(MIN)
7
PULSE-WIDTH MODULATOR SECTION
Maximum Duty Cycle
DC(MAX)
94
Minimum Duty Cycle
SUPPLY VOLTAGE
DC(MIN)
Power Startup Supply Current
Power Operating Supply Current
ICC+IC
ICC+IC
VFB and ISENSE at 0V
Power Supply Zener Voltage
VZ
ICC =25mA
30
Notes: 1. Adjust VCC above the start threshold before setting it to 15V.
2. Measured at the trip point of the latch, with VFB at 0V.
3. Measured between ISENSE and COMP, with the input changing from 0V ~ 0.8V.
TYP
52
0.2
5
1.7
8.3
2.5
-0.3
90
1
70
6
-0.8
6
0.7
3
1
70
-2
150
13.5
13.5
0.1
1.5
0.7
50
50
8.4
7.6
96
0.3
11
34
MAX UNIT
55 kHz
56 kHz
1%
%
V
8.8 mA
8.8 mA
2.55 V
-1 μA
dB
MHz
dB
mA
mA
V
1.1 V
3.15 V/V
1.1 V
dB
-10 μA
300 ns
V
V
0.4 V
2.2 V
1.2 V
150 ns
150 ns
9
V
8.2 V
100 %
0%
0.5 mA
17 mA
V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 9
QW-R103-048.E
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