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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)： | 4/15頁 |
| 文件大?。?/td> | 228K |
| 代理商： | UC3844TD |
Notes :
1. Max package power dissipation limits must be respected; low duty cycle pulse techniques are used during test maintain T
j
as
close to T
amb
as possible.
2. These parameters, although guaranteed, are not 100% tested in production.
3. Parameter measured at trip point of latch with V
PIN2
= 0.
4. Gain defined as :
V
PIN1
A =
; 0
≤
V
PIN3
≤
0.8 V
V
PIN3
5. Adjust V
i
above the start threshold before setting at 15 V.
ELECTRICAL CHARACTERISTICS
(continued)
Symbol
Parameter
Test Conditions
Value
Typ.
Unit
Min.
Max.
OUTPUT SECTION
V
OL
Output Low Level
I
SINK
= 20mA
I
SINK
= 200mA
ISOURCE = 20mA
0.1
0.4
V
1.6
2.2
V
V
OH
Output High Level
13
13.5
V
I
SOURCE
= 200mA
VCC = 6V; I
SINK
= 1mA
12
13.5
V
V
OLS
t
r
t
f
UVLO Saturation
0.1
1.1
V
Rise Time
T
j
= 25
°
C C
L
= 1nF (2)
T
j
= 25
°
C C
L
= 1nF (2)
50
150
ns
Fall Time
50
150
ns
UNDER-VOLTAGE LOCKOUT SECTION
Start Threshold
UC3842T/4T
15
16
17
V
UC3843T/5T
7.8
8.4
9.0
V
Min Operating Voltage
After Turn-on
UC3842T/4T
9
10
11
V
UC3843T/5T
7.0
7.6
8.2
V
PWM SECTION
Maximum Duty Cycle
UC3842T/3T
94
96
100
%
UC3844T/5T
47
48
50
%
Minimum Duty Cycle
0
%
TOTAL STANDBY CURRENT
I
st
Start-up Current
V
i
= 6.5V for UC3843T/45T
0.3
0.5
mA
V
i
= 14V for UC3842T/44T
0.3
0.5
mA
I
i
Operating Supply Current
V
PIN2
= V
PIN3
= 0V
I
i
= 25mA
12
17
mA
V
iz
Zener Voltage
30
36
V
UC3842T - UC3843T - UC3844T - UC3845T
4/15
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