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參數(shù)資料
| 型號： | TL5001MFK |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, CQCC20 |
| 封裝： | CERAMIC, LCC-20 |
| 文件頁數(shù)： | 27/31頁 |
| 文件大小： | 745K |
| 代理商： | TL5001MFK |
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TL5001, TL5001A
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS084F – APRIL 1994 – REVISED JANUARY 2002
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 (CSCP), connected between the SCP terminal and ground,
towards 2.5 V through a 185-k
resistor (RSCP). 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:
V
SCP +
(2.5
* 0.185) 1 * e–t t ) 0.185
Where
τ = RSCPCSCP
The end of the time-out period, tSCP, occurs when VSCP = 1 V. Solving for CSCP yields:
C
SCP + 12.46
t
SCP
Where
t is in seconds, C in
F.
tSCP 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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