參數(shù)資料
型號(hào)： TL500
廠商： Texas Instruments, Inc.
英文描述： PULSE-WIDTH-MODULATION CONTROL CIRCUITS
中文描述： 脈寬調(diào)制控制電路
文件頁(yè)數(shù)： 5/23頁(yè)
文件大?。?/td> 348K
代理商： TL500
TL5001, TL5001A
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS084E – APRIL 1994 – REVISED OCTOBER 1999
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
short-circuit protection (SCP) (continued)
Q1
12 k
185 k
RSCP
Q2
SCP
Comparator 2
Vref = 1 V
SCP
Comparator 1
1.5 V
From Error
Amp
CSCP
To Output
Drive Logic
SCP
5
2.5 V
Figure 3. SCP Circuit
The timer operates by charging an external capacitor (C
SCP
), connected between the SCP terminal and ground,
towards 2.5 V through a 185-k
resistor (R
SCP
). The circuit begins charging from an initial voltage of
approximately 185 mV and times out when the capacitor voltage reaches 1 V. The output of SCP comparator
2 then goes high, turns on Q2, and latches the timer circuit. The expression for setting the SCP time period is
derived from the following equation:
VSCP
(2.5
0.185) 1
e–t
0.185
Where
τ
= R
SCP
C
SCP
The end of the time-out period, t
SCP
, occurs when V
SCP
= 1 V. Solving for C
SCP
yields:
C
SCP
12.46
t
SCP
Where
t is in seconds, C in
μ
F.
t
SCP
must be much longer (generally 10 to 15 times) than the converter start-up period or the converter will not
start.
output transistor
The output of the TL5001/A is an open-collector transistor with a maximum collector current rating of 21 mA and
a voltage rating of 51 V. The output is turned on under the following conditions: the oscillator triangle wave is
lower than both the DTC voltage and the error-amplifier output voltage, the UVLO circuit is inactive, and the
short-circuit protection circuit is inactive.
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