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参数资料
| 型号： | PJ3845BCS |
| 元件分类： | 稳压器 |
| 英文描述： | 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | PLASTIC, SOP-8 |
| 文件页数： | 8/14页 |
| 文件大小： | 841K |
| 代理商： | PJ3845BCS |
PJ3844B / PJ3845B
High Performance Current Mode Controller
3-14
2002.rev. A
PJ3844B /PJ3845B
Characteristic
Symbol
Min
Typ
Max
Unit
ERROR AMPLIFIER SECTION
Voltage Feedback Input (Vo=2.5V)
VFB
2.42
2.5
2.58
V
Input Bias Current (VFB=5.0V)
IIB
-
-0.1
-2.0
μΑ
Open-Loop Voltage Gain (Vo=2.0V to 4.0V)
AVOL
65
90
-
dB
Unity Gain Bandwidth (TJ=25℃)
BW
0.7
1.0
-
MHz
Power Supply Rejection Radio (VCC=12V to 25V)
PSRR
60
70
-
dB
Output Current
Sink (Vo=1.1V, VFB =2.7V)
Source ( Vo=5.0V, VFB =2.3V)
Isink
ISource
2.0
-0.5
12
-1.0
-
mA
Output Voltage Swing
High State (RL=15K to ground, VFB=2.3V)
VOH
5.0
6.2
-
V
Low State (RL=15K to Vref, VFB=2.7V)
VOL
-
0.8
1.1
CURRENT SENSE SECTION
Current Sense Input Voltage Gain (Note 4&5)
Av
2.85
3.0
3.15
V/V
Maximum Current Sense Input Threshold(Note 4)
Vth
0.9
1.0
1.1
V
Power Supply Rejection Radio
VCC=12V to 25V,Note 4
PSRR
-
70
-
dB
Input Bias Current
IIB
-
-2.0
-10
μΑ
Propagation Delay(Current Sense Input to Output)
tPLH(IN/OUT)
-
150
300
ns
OUTPUT SECTION
Output Voltage
Low State (Isink=20mA)
(Isink=200mA)
High State (Isource=20mA)
(Isource=200mA)
VOL
VOH
-
13
12
0.1
1.6
13.5
13.4
0.4
2.2
-
V
Output Voltage with UVLO Activated
VCC=6.0V,Isink=1.0mA
VOL(UVLO)
-
0.1
1.1
V
Output Voltage Rise Time (CL=1.0nF,TJ=25℃)
tr
-
50
150
ns
Output Voltage Fall Time (CL=1.0nF,TJ=25℃)
tf
-
50
150
ns
UNDERVOLTAGE LOCKOUT SECTION
Start-Up Threshold
PJ3844B
PJ3845B
Vth
14.5
7.8
16
8.4
17.5
9.0
V
Minimum Operating Voltage After Turn-On
PJ3844B
PJ3845B
VCC(min)
8.5
7.0
10
7.6
11.5
8.2
V
PWM SECTION
Duty Cycle
Maximum
Minimum
DCmax
DCmin
47
-
48
-
50
0
%
TOTAL DEVICE
Power Supply Current
Start-Up, VCC=14V
Operating (Note 2)
ICC
-
0.25
12
0.5
17
mA
Power Supply Zener Voltage (ICC=25mA)
Vz
30
36
-
V
ELECTRICAL CHARACTERISTICS (VCC =15V(Note 2) , RT=10K CT=3.3nF TA=Tlow to Thigh ( Note 3) unless otherwise
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