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UC3844 参数 Datasheet PDF下载

UC3844图片预览
型号: UC3844
PDF下载: 下载PDF文件 查看货源
内容描述: 高性能电流模式控制器 [HIGH PERFORMANCE CURRENT MODE CONTROLLERS]
分类和应用: 控制器
文件页数/大小: 14 页 / 380 K
品牌: MOTOROLA [ MOTOROLA ]
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UC3844, 45 UC2844, 45  
MAXIMUM RATINGS  
Rating  
Symbol  
(I + I )  
Value  
Unit  
mA  
A
Total Power Supply and Zener Current  
Output Current, Source or Sink (Note 1)  
Output Energy (Capacitive Load per Cycle)  
Current Sense and Voltage Feedback Inputs  
Error Amp Output Sink Current  
30  
CC  
Z
I
O
1.0  
5.0  
W
µJ  
V
in  
– 0.3 to + 5.5  
10  
V
I
O
mA  
Power Dissipation and Thermal Characteristics  
D Suffix, Plastic Package, Case 751A  
Maximum Power Dissipation @ T = 25°C  
Thermal Resistance Junction–to–Air  
N Suffix, Plastic Package, Case 626  
P
862  
145  
mW  
°C/W  
A
D
R
θJA  
Maximum Power Dissipation @ T = 25°C  
Thermal Resistance Junction–to–Air  
P
1.25  
100  
W
°C/W  
A
D
R
θJA  
Operating Junction Temperature  
T
+ 150  
°C  
°C  
J
Operating Ambient Temperature  
UC3844, UC3845  
T
A
0 to + 70  
UC2844, UC2845  
– 25 to + 85  
Storage Temperature Range  
T
stg  
– 65 to + 150  
°C  
ELECTRICAL CHARACTERISTICS (V  
unless otherwise noted.)  
= 15 V, [Note 2], R = 10 k, C = 3.3 nF, T = T  
to T [Note 3],  
high  
CC  
T
T
A
low  
UC284X  
Typ  
UC384X  
Typ  
Characteristics  
Symbol  
Min  
Max  
Min  
Max  
Unit  
REFERENCE SECTION  
Reference Output Voltage (I = 1.0 mA, T = 25°C)  
V
ref  
4.95  
5.0  
2.0  
3.0  
0.2  
5.05  
20  
4.9  
5.0  
2.0  
3.0  
0.2  
5.1  
20  
V
mV  
mV  
mV/°C  
V
O
J
Line Regulation (V  
CC  
= 12 V to 25 V)  
Reg  
line  
load  
S
Load Regulation (I = 1.0 mA to 20 mA)  
O
Reg  
T
25  
25  
Temperature Stability  
Total Output Variation over Line, Load, Temperature  
Output Noise Voltage (f = 10 Hz to kHz, T = 25°C)  
V
ref  
4.9  
5.1  
4.82  
5.18  
V
n
50  
50  
µV  
J
Long Term Stability (T = 125°C for 1000 Hours)  
S
5.0  
– 85  
5.0  
– 85  
mV  
mA  
A
Output Short Circuit Current  
I
– 30  
– 180  
– 30  
– 180  
SC  
OSCILLATOR SECTION  
Frequency  
f
kHz  
osc  
T = 25°C  
47  
46  
52  
57  
60  
47  
46  
52  
57  
60  
J
A
T
= T  
to T  
high  
low  
Frequency Change with Voltage (V  
= 12 V to 25 V)  
f  
osc/ V  
0.2  
5.0  
1.0  
0.2  
5.0  
1.0  
%
%
CC  
Frequency Change with Temperature  
= T to T  
f  
osc/ T  
T
A
low  
Oscillator Voltage Swing (Peak–to–Peak)  
Discharge Current (V = 2.0 V, T = 25°C)  
high  
V
osc  
1.6  
1.6  
V
I
dischg  
10.8  
10.8  
mA  
osc  
J
NOTES: 1. Maximum Package power dissipation limits must be observed.  
2. Adjust V above the Startup threshold before setting to 15 V.  
CC  
3. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible  
T
T
= –20°C for UC3844, UC3845  
= –25°C for UC2844, UC2845  
T
T
= +70°C for UC3844, UC3845  
= +85°C for UC2844, UC2845  
low  
low  
high  
high  
2
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