參數(shù)資料
型號(hào)： UCX823B
廠商： Texas Instruments, Inc.
英文描述： High Speed PWM Controller
中文描述： 高速PWM控制器
文件頁數(shù)： 4/9頁
文件大?。?/td> 456K
代理商： UCX823B
4
PARAMETER
Current Limit/Start Sequence/Fault Section (cont.)
Over Current Threshold
TEST CONDITIONS
MIN
TYP
MAX
UNITS
1.14
1.2
1.26
V
ILIM Delay to Output
Output Section
Output Low Saturation
V
ILIM
=
0 to 2V Step (Note 1)
50
80
ns
I
OUT
=
20mA
I
OUT
= 200mA
I
OUT
=
20mA
I
OUT
= 200mA
I
O
=
20mA
C
L
=
1nF (Note 1)
0.25
0.4
V
1.2
2.2
V
Output High Saturation
1.9
2.9
V
2
3
V
UVLO Output Low Saturation
0.8
1.2
V
Rise/Fall Time
UnderVoltage Lockout
Start Threshold
20
45
ns
UCX823B and X825B only
16
17
V
Stop Threshold
UCX823B and X825B only
9
10
V
UVLO Hysteresis
UCX823B and X825B only
5
6
7
V
Start Threshold
UCX823A and X825A only
8.4
9.2
9.6
V
UVLO Hysteresis
Supply Current
Startup Current
Icc
Note 1: Guaranteed by design. Not 100% tested in production.
UCX823A and X825A only
0.4
0.8
1.2
V
VC
=
VCC
=
V
TH
(start) - 0.5V
100
28
300
36
μ
A
mA
UC1823A,B/1825A,B
UC2823A,B/2825A,B
UC3823A,B/3825A,B
ELECTRICAL CHARACTERISTICS (cont.)
Unless otherwise stated, these specifications apply for T
A
=
55
°
C to
+
125
°
C for the UC1823A,B and UC1825A,B;
40
°
C to
+
85
°
C for the UC2823A,B and UC2825A,B; 0
°
C to
+
70
°
C for the
UC3823A,B and UC3825A,B; RT
=
3.65k, CT
=
1nF, VCC
=
12V, T
A
=
T
J
.
OSCILLATOR
The UC3823A,B/3825A,B oscillator is a saw tooth. The
rising edge is governed by a current controlled by the RT
pin and value of capacitance at the CT pin. The falling
edge of the sawtooth sets dead time for the outputs. Se-
lection of RT should be done first, based on desired max-
imum duty cycle. CT can then be chosen based on de-
sired frequency, RT, and D
MAX
. The design equations
are:
3V
(10mA) (1 - D
MAX
)
RT =
CT =
Recommended values for RT range from 1k to 100k.
Control of D
MAX
less than 70% is not recommended.
(1.6 D
MAX
)
(RT F)
APPLICATIONS INFORMATION
Oscillator
UDG-95102
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