参数资料
型号: UC3843ANG
厂商: ON Semiconductor
文件页数: 4/18页
文件大小: 0K
描述: IC REG CTRLR FLYBK ISO PWM 8-DIP
产品变化通告: Product Discontinuation 15/May/2006
标准包装: 50
PWM 型: 电流模式
输出数: 1
频率 - 最大: 500kHz
占空比: 96%
电源电压: 7.6 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 70°C
封装/外壳: 8-DIP(0.300",7.62mm)
包装: 管件
其它名称: UC3843ANGOS
UC3842A, UC3843A, UC2842A, UC2843A
ELECTRICAL CHARACTERISTICS (V CC = 15 V, [Note 4], R T = 10 k, C T = 3.3 nF, T A = T low to T high [Note 5],
unless otherwise noted.)
UC284XA
UC384XA
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Notes 6 & 7)
Maximum Current Sense Input Threshold (Note 6)
A V
V th
2.85
0.9
3.0
1.0
3.15
1.1
2.85
0.9
3.0
1.0
3.15
1.1
V/V
V
Power Supply Rejection Ratio
PSRR
dB
V CC = 12 to 25 V (Note 6)
?
70
?
?
70
?
Input Bias Current
Propagation Delay (Current Sense Input to Output)
I IB
t PLH(in/out)
?
?
?2.0
150
?10
300
?
?
?2.0
150
?10
300
m A
ns
OUTPUT SECTION
Output Voltage
V
Low State (I Sink = 20 mA)
Low State (I Sink = 200 mA)
High State (I Sink = 20 mA)
High State (I Sink = 200 mA)
V OL
V OH
?
?
13
12
0.1
1.6
13.5
13.4
0.4
2.2
?
?
?
?
13
12
0.1
1.6
13.5
13.4
0.4
2.2
?
?
Output Voltage with UVLO Activated
V OL(UVLO)
V
V CC = 6.0 V, I Sink = 1.0 mA
?
0.1
1.1
?
0.1
1.1
Output Voltage Rise Time (C L = 1.0 nF, T J = 25 ° C)
Output Voltage Fall Time (C L = 1.0 nF, T J = 25 ° C)
t r
t f
?
?
50
50
150
150
?
?
50
50
150
150
ns
ns
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold
V th
V
UCX842A
UCX843A
15
7.8
16
8.4
17
9.0
14.5
7.8
16
8.4
17.5
9.0
Minimum Operating Voltage After Turn?On
V CC(min)
V
UCX842A
UCX843A
9.0
7.0
10
7.6
11
8.2
8.5
7.0
10
7.6
11.5
8.2
PWM SECTION
Duty Cycle
%
Maximum
Minimum
DC max
DC min
94
?
96
?
?
0
94
?
96
?
?
0
TOTAL DEVICE
Power Supply Current (Note 4)
Startup:
I CC
mA
(V CC = 6.5 V for UCX843A,
(V CC = 14 V for UCX842A) Operating
?
?
0.5
12
1.0
17
?
?
0.5
12
1.0
17
Power Supply Zener Voltage (I CC = 25 mA)
V Z
30
36
?
30
36
?
V
D V Output Compensation
4. Adjust V CC above the Startup threshold before setting to 15 V.
5. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
T low = 0 ° C for UC3842A, UC3843A T high = +70 ° C for UC3842A, UC3843A
?25 ° C for UC2842A, UC2843A +85 ° C for UC2842A, UC2843A
6. This parameter is measured at the latch trip point with V FB = 0 V.
7. Comparator gain is defined as: A V
D V Current Sense Input
http://onsemi.com
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