參數(shù)資料
型號(hào)： UC2845
廠商： ON SEMICONDUCTOR
英文描述： High Performance Current Mode Controllers(高性能電流模式控制器)
中文描述： 高性能電流模式控制器（高性能電流模式控制器）
文件頁(yè)數(shù)： 2/16頁(yè)
文件大?。?/td> 354K
代理商： UC2845
UC3844, UC3845, UC2844, UC2845
http://onsemi.com
2
MAXIMUM RATINGS
Rating
Symbol
Value
Unit
Total Power Supply and Zener Current
(I
CC
+ I
Z
)
30
mA
Output Current, Source or Sink (Note 1)
I
O
1.0
A
Output Energy (Capacitive Load per Cycle)
W
5.0
J
Current Sense and Voltage Feedback Inputs
V
in
0.3 to + 5.5
V
Error Amp Output Sink Current
I
O
10
mA
Power Dissipation and Thermal Characteristics
D Suffix, Plastic Package, Case 751A
Maximum Power Dissipation @ T
= 25
°
C
Thermal Resistance JunctiontoAir
N Suffix, Plastic Package, Case 626
Maximum Power Dissipation @ T
A
= 25
°
C
Thermal Resistance JunctiontoAir
P
D
R
JA
P
D
R
JA
T
J
862
145
1.25
100
mW
°
C/W
W
°
C/W
°
C
Operating Junction Temperature
+ 150
Operating Ambient Temperature
UC3844, UC3845
UC2844, UC2845
T
A
0 to + 70
25 to + 85
°
C
Storage Temperature Range
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. Maximum Package power dissipation limits must be observed.
T
stg
65 to + 150
°
C
ELECTRICAL CHARACTERISTICS
(V
CC
= 15 V, (Note 2), R
T
= 10 k, C
T
= 3.3 nF, T
A
= T
low
to T
high
(Note 3), unless otherwise noted.)
UC284X
UC384X
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
REFERENCE SECTION
Reference Output Voltage (I
O
= 1.0 mA, T
J
= 25
°
C)
V
ref
4.95
5.0
5.05
4.9
5.0
5.1
V
Line Regulation (V
CC
= 12 V to 25 V)
Load Regulation (I
O
= 1.0 mA to 20 mA)
Reg
line
Reg
load
2.0
20
2.0
20
mV
3.0
25
3.0
25
mV
Temperature Stability
T
S
0.2
0.2
mV/
°
C
Total Output Variation over Line, Load, Temperature
V
ref
4.9
5.1
4.82
5.18
V
Output Noise Voltage (f = 10 Hz to kHz, T
J
= 25
°
C)
Long Term Stability (T
A
= 125
°
C for 1000 Hours)
V
n
50
50
V
S
5.0
5.0
mV
Output Short Circuit Current
I
SC
30
85
180
30
85
180
mA
OSCILLATOR SECTION
Frequency
T
J
= 25
°
C
T
A
= T
low
to T
high
Frequency Change with Voltage (V
CC
= 12 V to 25 V)
f
osc
47
46
52
57
60
47
46
52
57
60
kHz
f
osc/ V
0.2
1.0
0.2
1.0
%
Frequency Change with Temperature
T
A
= T
low
to T
high
f
osc/ T
5.0
5.0
%
Oscillator Voltage Swing (PeaktoPeak)
V
osc
1.6
1.6
V
Discharge Current (V
osc
= 2.0 V, T
J
= 25
°
C)
I
dischg
10.8
10.8
mA
ERROR AMPLIFIER SECTION
Voltage Feedback Input (V
O
= 2.5 V)
V
FB
2.45
2.5
2.55
2.42
2.5
2.58
V
Input Bias Current (V
FB
= 2.7 V)
I
IB
0.1
1.0
0.1
2.0
A
Open Loop Voltage Gain (V
O
= 2.0 V to 4.0 V)
2. Adjust V
CC
above the Startup threshold before setting to 15 V.
3. 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
A
VOL
65
90
65
90
dB
相關(guān)PDF資料
PDF描述
UC3845 High Performance Current Mode Controllers(高性能電流模式控制器)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UC2845A 制造商:TI 制造商全稱:Texas Instruments 功能描述:Current Mode PWM Controller
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UC2845AD1013TR 制造商:STMicroelectronics 功能描述:
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