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| 型號： | UC3868QTR |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Resonant-Mode Power Supply Controllers |
| 中文描述： | 諧振模式電源控制器 |
| 文件頁數(shù)： | 3/9頁 |
| 文件大?。?/td> | 438K |
| 代理商： | UC3868QTR |
3
UC1861-1868
UC2861-2868
UC3861-3868
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, all specifications apply for –55
°
C
≤
T
A
≤
125
°
C for the
UC186x, –25
°
C
≤
T
A
≤
85
°
C for the UC286x, and 0
°
C
≤
T
A
≤
70
°
C for the UC386x, V
CC
=12V, C
VCO
=1nF, Range=7.15k, R
MIN
=86.6k,
C=200pF, R=4.02k, and Csr=0.1
μ
F. T
A
=T
J .
PARAMETER
TEST CONDITIONS
5V Generator
Output Voltage
12V
≤
Vcc
≤
20V, –10mA
≤
I
O
≤
0mA
Short Circuit Current
V
O
= 0V
Soft-Reference
Restart Delay Current
V = 2V
Soft Start Current
V = 2V
Reference Voltage
T
J
= 25
°
C, I
O
= 0A
12V
≤
V
CC
≤
20V, –200
μ
A
≤
I
O
≤
200
μ
A
Line Regulation
12V
≤
V
CC
≤
20V
Load Regulation
–200
μ
A
≤
I
O
≤
200
μ
A
Error Amplifier (Note 3)
Input Offset Voltage
V
CM
= 5V, Vo = 2V, I
O
= 0A
Input Bias Current
V
CM
= 0V
Voltage Gain
Vcm = 5V, 0.5V
≤
V
O
≤
3.7V, I
O
= 0A
Power Supply Rejection Ratio
Vcm = 5V, V
O
= 2V, 12V
≤
V
CC
≤
20V
Error Amplifier (Note 3) (cont.)
Common Mode Rejection Ratio
0V
≤
Vcm
≤
6V, V
O
= 2V
V
OUT
Low
V
ID
= –100mV, I
O
= 200
μ
A
V
OUT
High
V
ID
= 100mV, I
O
= –200
μ
A
Unity Gain Bandwidth
(Note 4)
Voltage Controlled Oscillator
Maximum Frequency
V
ID
(Error Amp) = 100mV, T
J
= 25
°
C
V
ID
(Error Amp) = 100mV
Minimum Frequency
V
ID
(Error Amp) = –100mV, T
J
= 25
°
C
V
ID
(Error Amp) = –100mV
One Shot
Zero Comparator Vth
Propagation Delay
(Note 4)
Maximum Pulse Width
V
ZERO
= 1V
Maximum to Minimum Pulse
V
ZERO
= 0V UCx861 – UCx864
Width Ratio
V
ZERO
= 0V UCx865 – UCx868. –55°C to +85°C
V
ZERO
= 0V UCx865 – UCx868, +125°C
Output Stage
Rise and Fall Time
C
LOAD
= 1nF (Note 4)
Output Low Saturation
I
O
= 20mA
I
O
= 200mA
Output High Saturation
I
O
= –200mA, down from Vcc
UVLO Low Saturation
I
O
= 20mA
Fault Comparator
Fault Comparator Vth
Delay to Output
(Note 4) (Note 5)
MIN
TYP
MAX
UNITS
4.8
–150
5.0
5.2
–15
V
mA
10
20
35
μ
A
μ
A
V
V
mV
mV
–650
4.95
4.85
–500
5.00
–350
5.05
5.15
20
30
2
10
–10
–2.0
70
70
10
mV
μ
A
dB
dB
–0.3
100
100
65
100
0.17
4.2
0.8
dB
V
V
MHz
0.25
3.9
0.5
450
425
45
42
500
550
575
55
58
kHz
kHz
kHz
kHz
50
0.45
0.50
120
1000
4
5.5
5.5
0.55
200
1150
5.5
7
7
V
ns
ns
850
2.5
4
3.8
25
0.2
0.5
1.7
0.8
45
0.5
2.2
2.5
1.5
ns
V
V
V
V
2.85
3.00
100
3.15
200
V
ns
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