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参数资料
| 型号： | UC3844NG |
| 厂商： | ON Semiconductor |
| 文件页数： | 3/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 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： | 60kHz |
| 占空比： | 50% |
| 电源电压： | 10 V ~ 30 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 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： | UC3844NGOS |
UC3844, UC3845, UC2844, UC2845
ELECTRICAL CHARACTERISTICS (V CC = 15 V, (Not e 4), R T = 10 k, C T = 3.3 nF, T A = T low to T hig h (Note 5), unless otherwise noted.)
UC284X
UC384X
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
ERROR AMPLIFIER SECTION (continued)
Unity Gain Bandwidth (T J = 25 ° C)
Power Supply Rejection Ratio (V CC = 12 V to 25 V)
BW
PSRR
0.7
60
1.0
70
?
?
0.7
60
1.0
70
?
?
MHz
dB
Output Current
mA
Sink (V O = 1.1 V, V FB = 2.7 V)
Source (V O = 5.0 V, V FB = 2.3 V)
I Sink
I Source
2.0
? 0.5
12
? 1.0
?
?
2.0
? 0.5
12
? 1.0
?
?
Output Voltage Swing
V
High State (R L = 15 k to ground, V FB = 2.3 V)
Low State (R L = 15 k to V ref , V FB = 2.7 V)
V OH
V OL
5.0
?
6.2
0.8
?
1.1
5.0
?
6.2
0.8
?
1.1
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 V 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)
(I Sink = 200 mA)
High State (I Sink = 20 mA)
(I Sink = 200 mA)
V OL
V OH
?
?
12
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 CC = 6.0 V, I Sink = 1.0 mA
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)
V OL(UVLO)
t r
t f
?
?
?
0.1
50
50
1.1
150
150
?
?
?
0.1
50
50
1.1
150
150
V
ns
ns
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold
UCX844
UCX845
Minimum Operating Voltage After Turn ? On
UCX844
UCX845
V th
V CC(min)
15
7.8
9.0
7.0
16
8.4
10
7.6
17
9.0
11
8.2
14.5
7.8
8.5
7.0
16
8.4
10
7.6
17.5
9.0
11.5
8.2
V
V
PWM SECTION
Duty Cycle
%
Maximum
Minimum
DC max
DC min
46
?
48
?
50
0
47
?
48
?
50
0
TOTAL DEVICE
Power Supply Current (Note 4)
Startup:
I CC
mA
(V CC = 6.5 V for UCX845A,
(V CC 14 V for UCX844) 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
7. Comparator gain is defined as: A V
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 UC3844, UC3845 T high = +70 ° C for UC3844, UC3845
? 25 ° C for UC2844, UC2845 +85 ° C for UC2844, UC2845
6. This parameter is measured at the latch trip point with V FB = 0 V.
D V Output Compensation
D V Current Sense Input
http://onsemi.com
3
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| UC3844NG4 | 功能描述:电流型 PWM 控制器 Current-Mode PWM Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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