參數(shù)資料
型號(hào)： UC3845B
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)： 3/18頁(yè)
文件大?。?/td> 400K
代理商： UC3845B
UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
3
ELECTRICAL CHARACTERISTICS
(V
CC
= 15 V [Note 4], 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 5], unless otherwise noted.)
UC284XB
UC384XB, XBV
Characteristic
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
ERROR AMPLIFIER SECTION
Voltage Feedback Input (V
O
= 2.5 V)
Input Bias Current (V
FB
= 5.0 V)
Open Loop Voltage Gain (V
O
= 2.0 V to 4.0 V)
Unity Gain Bandwidth (T
J
= 25
°
C)
Power Supply Rejection Ratio (V
CC
= 12 V to 25 V)
Output Current
Sink (V
O
= 1.1 V, V
FB
= 2.7 V)
Source (V
O
= 5.0 V, V
FB
= 2.3 V)
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)
(UC284XB, UC384XB)
(UC384XBV)
V
FB
I
IB
A
VOL
BW
2.45
2.5
2.55
2.42
2.5
2.58
V
0.1
1.0
0.1
2.0
A
65
90
65
90
dB
0.7
1.0
0.7
1.0
MHz
PSRR
60
70
60
70
dB
I
Sink
I
Source
2.0
0.5
12
1.0
2.0
0.5
12
1.0
mA
V
OH
V
OL
5.0
6.2
0.8
1.1
5.0
6.2
0.8
0.8
1.1
1.2
V
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Notes 6 & 7)
(UC284XB, UC384XB)
(UC384XBV)
A
V
2.85
3.0
3.15
2.85
2.85
3.0
3.0
3.15
3.25
V/V
Maximum Current Sense Input Threshold (Note 6)
(UC284XB, UC384XB)
(UC384XBV)
V
th
0.9
1.0
1.1
0.9
0.85
1.0
1.0
1.1
1.1
V
Power Supply Rejection Ratio
(V
CC
= 12 V to 25 V) (Note 6)
Input Bias Current
PSRR
70
70
dB
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, UC284XB, UC384XB)
(I
Sink
= 200 mA, UC384XBV)
High State (I
Source
= 20 mA, UC284XB, UC384XB)
(I
Source
= 20 mA, UC384XBV)
(I
Source
= 200 mA)
Output Voltage with UVLO Activated (V
CC
= 6.0 V, I
Sink
= 1.0 mA)
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)
V
OL
V
OH
13
12
0.1
1.6
13.5
13.4
0.4
2.2
13
12.9
12
0.1
1.6
1.6
13.5
13.4
0.4
2.2
2.3
V
V
OL(UVLO)
t
r
t
f
0.1
1.1
0.1
1.1
V
50
150
50
150
ns
50
150
50
150
ns
UNDERVOLTAGE LOCKOUT SECTION
Startup Threshold
UCX844B, BV
UCX845B, BV
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
UCX844B, BV
UCX845B, BV
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
4. Adjust V
CC
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 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
6. This parameter is measured at the latch trip point with V
= 0 V.
7. Comparator gain is defined as: A
V
=
V Current Sense Input
V Output/Compensation
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
UC3845BAC 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:HIGH PERFORMANCE CURRENT MODE CONTROLLERS
UC3845BD 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
UC3845BD1 功能描述:電流型 PWM 控制器 PWM CONTROLLER RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
UC3845BD1013TR 功能描述:電流型 PWM 控制器 0.5mA Current Mode RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
UC3845BD1G 功能描述:電流型 PWM 控制器 52kHz 1A Current PWM w/48% Duty Cycle Max RoHS:否 制造商:Texas Instruments 開關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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