- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄381149 > UC3845 (ON SEMICONDUCTOR) High Performance Current Mode Controllers(高性能電流模式控制器) PDF資料下載
參數(shù)資料
| 型號： | UC3845 |
| 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） |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 354K |
| 代理商： | UC3845 |
UC3844, UC3845, UC2844, UC2845
http://onsemi.com
3
ELECTRICAL CHARACTERISTICS
(V
CC
= 15 V, (Note 4), R
T
= 10 k, C
T
= 3.3 nF, T
A
= T
low
to T
high
(Note 5), unless otherwise noted.)
UC284X
UC384X
Characteristics
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
ERROR AMPLIFIER SECTION (continued)
Unity Gain Bandwidth (T
J
= 25
°
C)
Power Supply Rejection Ratio (V
CC
= 12 V to 25 V)
BW
0.7
1.0
0.7
1.0
MHz
PSRR
60
70
60
70
dB
Output Current
Sink (V
O
= 1.1 V, V
FB
= 2.7 V)
Source (V
O
= 5.0 V, V
FB
= 2.3 V)
I
Sink
I
Source
2.0
0.5
12
1.0
2.0
0.5
12
1.0
mA
Output Voltage Swing
High State (R
L
= 15 k to ground, V
FB
= 2.3 V)
Low State (R
L
= 15 k to V
ref
, V
FB
= 2.7 V)
V
OH
V
OL
5.0
6.2
0.8
1.1
5.0
6.2
0.8
1.1
V
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Notes 6 & 7)
A
V
2.85
3.0
3.15
2.85
3.0
3.15
V/V
Maximum Current Sense Input Threshold (Note 6)
V
th
0.9
1.0
1.1
0.9
1.0
1.1
V
Power Supply Rejection Ratio
V
CC
= 12 V to 25 V (Note 6)
PSRR
70
70
dB
Input Bias Current
I
IB
2.0
10
2.0
10
A
Propagation Delay (Current Sense Input to Output)
t
PLH(IN/OUT)
150
300
150
300
ns
OUTPUT SECTION
Output Voltage
Low State (I
Sink
= 20 mA)
(I
Sink
= 200 mA)
High State (I
Sink
= 20 mA)
(I
Sink
= 200 mA)
V
OL
V
OH
12
12
0.1
1.6
13.5
13.4
0.4
2.2
13
12
0.1
1.6
13.5
13.4
0.4
2.2
V
Output Voltage with UVLO Activated
V
CC
= 6.0 V, I
Sink
= 1.0 mA
V
OL(UVLO)
0.1
1.1
0.1
1.1
V
Output Voltage Rise Time (C
L
= 1.0 nF, T
J
= 25
°
C)
Output Voltage Fall Time (C
L
= 1.0 nF, T
J
= 25
°
C)
t
r
50
150
50
150
ns
t
f
50
150
50
150
ns
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold
UCX844
UCX845
V
th
15
7.8
16
8.4
17
9.0
14.5
7.8
16
8.4
17.5
9.0
V
Minimum Operating Voltage After TurnOn
UCX844
UCX845
V
CC(min)
9.0
7.0
10
7.6
11
8.2
8.5
7.0
10
7.6
11.5
8.2
V
PWM SECTION
Duty Cycle
Maximum
Minimum
DC
max
DC
min
46
48
50
0
47
48
50
0
%
TOTAL DEVICE
Power Supply Current (Note 4)
Startup:
(V
CC
= 6.5 V for UCX845A,
(V
CC
14 V for UCX844) Operating
I
CC
0.5
12
1.0
17
0.5
12
1.0
17
mA
Power Supply Zener Voltage (I
CC
= 25 mA)
4. Adjust V
above the Startup threshold before setting to 15 V.
5. 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
6. This parameter is measured at the latch trip point with V
FB
= 0 V.
7. Comparator gain is defined as: A
V
V Current Sense Input
V
Z
30
36
30
36
V
V Output Compensation
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| UC2845AAY | CURRENT MODE PWM CONTROLLER |
| UC284XA | CURRENT MODE PWM CONTROLLER |
| UC2845AL | |
| UC1842AL | Automotive 8-bit MCU, with up to 32 Kbytes Flash, EEPROM, 10-bit ADC, timers, LIN, SPI, I2C, 3 V to 5.5 V |
| UC1849DW | Digitally controlled audio processor |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| UC3845A | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Current Mode PWM Controller |
| UC3845A-BW | 制造商:FCI 制造商全稱:First Components International 功能描述:Current Mode PWM Controller Low Start-Up and Operating Current |
| UC3845AD | 功能描述:電流型 PWM 控制器 Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3845AD1 | 功能描述:電流型 PWM 控制器 RO 511-UC3845BD 9/04 RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| UC3845AD1013TR | 制造商:STMicroelectronics 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。