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參數(shù)資料
| 型號： | UC3844TD |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | HIGH PERFORMANCE CURRENT MODE PWM CONTROLLER |
| 中文描述： | 高性能電流模式PWM控制器 |
| 文件頁數(shù)： | 3/15頁 |
| 文件大?。?/td> | 228K |
| 代理商： | UC3844TD |
ELECTRICAL CHARACTERISTICS
( [note 1] Unless otherwise stated, these specifications apply for
0 < T
amb
< 105°C; V
i
= 15V (note 5); R
T
= 10K; C
T
= 3.3nF)
Symbol
Parameter
Test Conditions
Value
Typ.
Unit
Min.
Max.
REFERENCE SECTION
V
REF
V
REF
V
REF
/
T
Line Regulation
12V
≤
V
i
≤
25V
1
≤
I
o
≤
20mA
(Note 2)
2
20
mV
Load Regulation
3
25
mV
Temperature Stability
0.2
mV/
°
C
V
Total Output Variation
Line, Load, Temperature
4.85
5.15
e
N
Output Noise Voltage
10Hz
≤
f
≤
10KHz T
j
= 25
°
C
(note 2)
T
amb
= 125
°
C, 1000Hrs (note 2)
50
μ
V
Long Term Stability
5
25
mV
I
SC
Output Short Circuit
-30
-100
-180
mA
OSCILLATOR SECTION
f
OSC
Frequency
T
j
= 25
°
C
T
A
= T
low
to T
high
T
J
= 25°C (R
T
= 6.2k, C
T
= 1nF)
V
CC
= 12V to 25V
49
48
225
52
–
250
55
56
275
KHz
KHz
KHz
f
OSC
/
V
f
OSC
/
T
V
OSC
I
dischg
ERROR AMP SECTION
V
2
I
b
Frequency Change with Volt.
–
0.2
1
%
Frequency Change with Temp.
T
A
= T
low
to T
high
–
1
–
%
Oscillator Voltage Swing
(peak to peak)
–
1.6
–
V
Discharge Current (V
OSC
=2V)
T
A
= T
low
to T
high
7.3
–
8.8
mA
Input Voltage
V
PIN1
= 2.5V
V
FB
= 5V
2.42
2.50
2.58
V
Input Bias Current
-0.1
-2
μ
A
dB
A
VOL
Unity Gain Bandwidth
2V
≤
V
o
≤
4V
T
J
= 25°C
12V
≤
V
i
≤
25V
V
PIN2
= 2.7V V
PIN1
= 1.1V
V
PIN2
= 2.3V V
PIN1
= 5V
V
PIN2
= 2.3V;
R
L
= 15K
to Ground
V
PIN2
= 2.7V;
R
L
= 15K
to Pin 8
65
90
BW
0.7
1
MHz
PSRR
Power Supply Rejec. Ratio
60
70
dB
I
o
I
o
Output Sink Current
2
12
mA
Output Source Current
-0.5
-1
mA
V
OUT
High
5
6.2
V
V
OUT
Low
0.8
1.1
V
CURRENT SENSE SECTION
G
V
Gain
V
3
Maximum Input Signal
SVR
Supply Voltage Rejection
(note 3 & 4)
2.85
3
3.15
V/V
V
PIN1
= 5V (note 3)
12
≤
V
i
≤
25V (note 3)
0.9
1
1.1
V
70
dB
I
b
Input Bias Current
-2
-10
μ
A
ns
Delay to Output
100
300
THERMAL DATA
Symbol
R
th j-amb
Description
Minidip
100
SO8
150
Unit
°
C/W
Thermal Resistance Junction-ambient. max.
U3842T - UC3843T - UC3844T - UC3845T
3/15
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