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參數(shù)資料
| 型號： | TL1454YD |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM) CONTROL CIRCUIT |
| 中文描述： | 雙通道脈寬調(diào)制（PWM）控制電路 |
| 文件頁數(shù)： | 7/24頁 |
| 文件大?。?/td> | 390K |
| 代理商： | TL1454YD |
TL1454, TL1454Y
DUAL-CHANNEL PULSE-WIDTH-MODULATION (PWM)
CONTROL CIRCUIT
SLVS086B – APRIL 1995 – REVISED NOVEMBER 1997
7
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251–1443
short-circuit protection (SCP) (continued)
The SCP time-out period must be greater than the converter start-up time or the converter will not start. Because
high-value capacitor tolerances tend to be
±
20% or more and IC resistor tolerances are loose as well, it is best
to choose an SCP time-out period 10-to-15 times greater than the converter startup time. The value of C
SCP
may be determined using Figure 6, or it can be calculated using:
C
SCP
T
SCP
80.3
where C
SCP
is in
μ
F and T
SCP
is the time-out period in ms.
output stage
The output stage of the TL1454 is a totem-pole output with a maximum source/sink current rating of 40 mA and
a voltage rating of 20 V. The output is controlled by a complementary output AND gate and is turned on (sourcing
current for OUT1, sinking current for OUT2) when all the following conditions are met: 1) the oscillator triangle
wave voltage is higher than both the DTC voltage and the error-amplifier output voltage, 2) the
undervoltage-lockout circuit is inactive, and 3) the short-circuit protection circuit is inactive.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
CC
(see Note 1)
Error amplifier input voltage: IN1+, IN1–, IN2+, IN2–
Output voltage: OUT1, OUT2
Continuous output current: OUT1, OUT2
Peak output current: OUT1, OUT2
Continuous total dissipation
Operating free-air temperature range, T
A
: C suffix
23 V
23 V
20 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I suffix
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds
±
200 mA
1 A
See Dissipation Rating Table
–20
°
C to 85
°
C
–40
°
C to 85
°
C
–65
°
C to 150
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
260
°
C
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: All voltage values are with respect to network GND.
DISSIPATION RATING TABLE
PACKAGE
TA
≤
25
°
C
POWER RATING
DERATING FACTOR
ABOVE TA = 25
°
C
7.6 mW/
°
C
10.0 mW/
°
C
4.0 mW/
°
C
TA = 70
°
C
POWER RATING
TA = 85
°
C
POWER RATING
D
950 mW
608 mW
494 mW
N
1250 mW
800 mW
650 mW
PW
500 mW
320 mW
260 mW
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