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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 4/23頁 |
| 文件大?。?/td> | 348K |
| 代理商： | TL500 |
TL5001, TL5001A
PULSE-WIDTH-MODULATION CONTROL CIRCUITS
SLVS084E – APRIL 1994 – REVISED OCTOBER 1999
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
dead-time control (DTC) (continued)
RDT
Rt
1250
D Voscmax – Voscmin
Voscmin
Where
R
DT
and R
t
are in ohms, D in decimal
Soft start can be implemented by paralleling the DTC resistor with a capacitor (C
DT
) as shown in Figure 2. During
soft start, the voltage at DTC is derived by the following equation:
VDT
IDTRDT
1–e–t RDTCDT
TL5001/A
DTC
CDT
RDT
6
Figure 2. Soft-Start Circuit
If the dc-to-dc converter must be in regulation within a specified period of time, the time constant, R
DT
C
DT
,
should be t
0
/3 to t
0
/5. The TL5001/A remains off until V
DT
≈
0.7 V, the minimum ramp value. C
DT
is discharged
every time UVLO or SCP becomes active.
undervoltage-lockout (UVLO) protection
The undervoltage-lockout circuit turns the output transistor off and resets the SCP latch whenever the supply
voltage drops too low (approximately 3 V at 25
°
C) for proper operation. A hysteresis voltage of 200 mV
eliminates false triggering on noise and chattering.
short-circuit protection (SCP)
The TL5001/A includes short-circuit protection (see Figure 3), which turns the power switch off to prevent
damage when the converter output is shorted. When activated, the SCP prevents the switch from being turned
on until the internal latching circuit is reset. The circuit is reset by reducing the input voltage until UVLO becomes
active or until the SCP terminal is pulled to ground externally.
When a short circuit occurs, the error-amplifier output at COMP rises to increase the power-switch duty cycle
in an attempt to maintain the output voltage. SCP comparator 1 starts an RC timing circuit when COMP exceeds
1.5 V. If the short is removed and the error-amplifier output drops below 1.5 V before time out, normal converter
operation continues. If the fault is still present at the end of the time-out period, the timer sets the latching circuit
and turns off the TL5001/A output transistor.
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