參數(shù)資料
型號： UC2844BD1R2
廠商： ON SEMICONDUCTOR
元件分類： 穩(wěn)壓器
英文描述： HIGH PERFORMANCE CURRENT MODE CONTROLLERS
中文描述： 1 A SWITCHING CONTROLLER, 275 kHz SWITCHING FREQ-MAX, PDSO8
封裝： SOIC-8
文件頁數(shù)： 3/20頁
文件大小： 317K
代理商： UC2844BD1R2
UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
3
MAXIMUM RATINGS
Rating
Symbol
(I
CC
+ I
Z
)
I
O
W
Value
30
Unit
mA
Total Power Supply and Zener Current
Output Current, Source or Sink (Note 1)
1.0
A
Output Energy (Capacitive Load per Cycle)
5.0
J
Current Sense and Voltage Feedback Inputs
V
in
I
O
0.3 to + 5.5
V
Error Amp Output Sink Current
10
mA
Power Dissipation and Thermal Characteristics
D Suffix, Plastic Package, SOIC14 Case 751A
Maximum Power Dissipation @ T
A
= 25
°
C
Thermal Resistance, JunctiontoAir
D1 Suffix, Plastic Package, SOIC8 Case 751
Maximum Power Dissipation @ T
A
= 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
P
D
R
JA
T
J
T
A
862
145
702
178
1.25
100
mW
°
C/W
mW
°
C/W
W
°
C/W
°
C
°
C
Operating Junction Temperature
+150
Operating Ambient Temperature
UC3844B, UC3845B
UC2844B, UC2845B
0 to + 70
25 to + 85
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. For typical values T
A
= 25
°
C, for min/max values
T
A
is the operating ambient temperature range that applies [Note 3], unless otherwise noted.)
UC284XB
UC384XB, XBV
Characteristic
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
REFERENCE SECTION
Reference Output Voltage (I
O
= 1.0 mA, T
J
= 25
°
C)
Line Regulation (V
CC
= 12 V to 25 V)
Load Regulation (I
O
= 1.0 mA to 20 mA)
Temperature Stability
V
ref
Reg
line
Reg
load
T
S
V
ref
V
n
S
4.95
5.0
5.05
4.9
5.0
5.1
V
2.0
20
2.0
20
mV
3.0
25
3.0
25
mV
mV/
°
C
V
0.2
0.2
Total Output Variation over Line, Load, and Temperature
Output Noise Voltage (f = 10 Hz to 10 kHz, T
J
= 25
°
C)
Long Term Stability (T
A
= 125
°
C for 1000 Hours)
Output Short Circuit Current
4.9
5.1
4.82
5.18
50
50
V
5.0
5.0
mV
I
SC
30
85
180
30
85
180
mA
OSCILLATOR SECTION
Frequency
T
J
= 25
°
C
T
A
= T
low
to T
high
T
J
= 25
°
C (R
T
= 6.2 k, C
T
= 1.0 nF)
Frequency Change with Voltage (V
CC
= 12 V to 25 V)
Frequency Change with Temperature (T
A
= T
low
to T
high
)
Oscillator Voltage Swing (PeaktoPeak)
f
OSC
49
48
225
52
250
55
56
275
49
48
225
52
250
55
56
275
kHz
f
OSC
/ V
f
OSC
/ T
V
OSC
I
dischg
0.2
1.0
0.2
1.0
%
1.0
0.5
%
1.6
1.6
V
Discharge Current (V
OSC
= 2.0 V)
T
J
= 25
°
C
T
A
= T
low
to T
high
(UC284XB, UC384XB)
T
A
= T
low
to T
high
(UC384XBV)
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 UC3844B, UC3845B
T
high
= + 70
°
C for UC3844B, UC3845B
= 25
°
C for UC2844B, UC2845B
= + 85
°
C for UC2844B, UC2845B
= 40
°
C for UC3844BV, UC3845BV
= +105
°
C for UC3844BV, UC3845BV
7.8
7.5
8.3
8.8
8.8
7.8
7.6
7.2
8.3
8.8
8.8
8.8
mA
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