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參數(shù)資料
| 型號(hào)： | NTE1723 |
| 廠商： | NTE Electronics, Inc. |
| 英文描述： | Integrated Circuit Pulse Width Modulator (PWM) Regulator |
| 中文描述： | 集成電路脈沖寬度調(diào)制（PWM）穩(wěn)壓器 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大小： | 31K |
| 代理商： | NTE1723 |
Electrical Characteristics (Cont’d):
(V
CC
= +20V, T
A
= 0
°
to +70
°
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Error Amplifier Section (Cont’d)
(V
CM
= +5.1V)
DC Open Loop Gain
A
VOL
V
OL
V
OH
CMRR
R
L
≤
10M
60
75
–
dB
Low Level Output Voltage
–
0.2
0.5
V
High Level Output Voltage
3.8
5.6
–
V
Common Mode Rejection Ratio
+1.5V
≤
V
CM
≤
+5.2V
+8V
≤
V
CC
≤
+35V
60
75
–
dB
Power Supply Rejection Ratio
PSRR
50
60
–
dB
PWM Comparator Section
Minimum Duty Cycle
DC
min
DC
max
V
TH
–
–
0
%
Maximum Duty Cycle
45
49
–
%
Input Threshold, Zero Duty Cycle
f
osc
= 40kHz, R
T
= 3.6k
,
C
T
= 0.01
μ
F, R
D
= 0
0.6
0.9
–
V
Input Threshold, Maximum Duty Cycle
–
3.3
3.6
V
μ
A
Input Bias Current
I
IB
–
0.05
1.0
Soft–Start Section
Soft
–
Start Current
V
shutdown
= 0V
V
shutdown
= 2.0V
V
shutdown
= 2.5V
25
50
80
μ
A
V
Soft
–
Start Voltage
–
0.4
0.6
Shutdown Input Current
–
0.4
1.0
mA
Output Drivers
(Each Output, V
CC
= +20V)
Output Low Level
V
OL
I
sink
= 20mA
I
sink
= 100mA
I
sink
= 20mA
I
sink
= 100mA
V8 and V9 = High
–
0.2
0.4
V
–
1.0
2.0
V
Output High Level
V
OH
18
19
–
V
17
18
–
V
Under Voltage Lockout
V
UL
I
C(leak)
t
r
t
f
t
ds
I
CC
6.0
7.0
8.0
V
μ
A
ns
Collector Leakage
V
C
= +35V, Note 3
C
L
= 1.0nF, T
J
= +25
°
C
C
L
= 1.0nF, T
J
= +25
°
C
V
DS
= +3V, C
S
= 0, T
J
= +25
°
C
V
CC
= +35V
–
–
200
Rise Time
–
100
600
Fall Time
–
50
300
ns
μ
s
mA
Shutdown Delay
–
0.2
0.5
Supply Current
–
14
20
Note 3.Applies to NTE1721
Only
, due to polarity of output pulses.
Application Information
(Shutdown Options)
:
Since both the compensation and soft
–
start terminals (Pin9 and Pin8) have current source pull
–
ups,
either can readily accept a pull
–
down signal which only has to sink a maximum of 100
μ
A to turn off
the outputs. This is subject to the added requirement of discharging whatever external capacitance
may be attached to these pins.
An alternate approach is the use of the shutdown circuitry of Pin10 which has been improved to en-
hance the available shutdown options. Activating this circuit by applying a positive signal on Pin10
performs two functions: the PWM latch is immediately set providing the fastest turn
–
off signal to the
outputs; and a 150
μ
A current sink begins to discharge the external soft
–
start capacitor. If the shut-
down command is short, the PWM signal is terminated without significant discharge of the soft
–
start
capacitor, thus, allowing, for example, a convenient implementation of pulse
–
by
–
pulse current limit-
ing. Holding Pin10 high for a longer duration, however, will ultimately discharge this external capaci-
tor, recycling slow turn
–
on upon release.
Pin10 should not be left floating as noise pickup could conceivably interrupt normal operation.
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