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參數(shù)資料
| 型號(hào)： | L6591TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO16 |
| 封裝： | ROHS COMPLIANT, SOP-16 |
| 文件頁數(shù)： | 13/32頁 |
| 文件大?。?/td> | 560K |
| 代理商： | L6591TR |
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Application information
L6591
20/32
Doc ID 14821 Rev 4
Equation 3
During the negative-going ramp of the sawtooth a clock pulse is released. A T flip-flop, along
with a logic circuit, separates the odd and the even clock pulses. The even ones turn off the
low-side MOSFET first and, after a dead time Td, turn on the high-side MOSFET. Normally,
the high-side MOSFET is turned off (and the low-side MOSFET turned on after the dead
time Td) in response to the control loop; in case of overload it will be the overcurrent
comparator to do the job or, in case of open control loop, the odd clock pulses will limit the
maximum ON-time within one oscillator cycle. In this way, the maximum duty cycle will be
limited right below 50% and the operating frequency of the converter will be half that of the
maximum achievable duty cycle is:
Equation 4
At start-up the first clock pulse will turn on the low-side MOSFET for 10 oscillator cycles to
charge the bootstrap capacitor and then the high-side MOSFET will switch on. When the IC
resumes switching during burst-mode operation the first clock pulse will turn-on the low-side
MOSFET first to charge the bootstrap capacitor, and just after the second clock pulse the
high-side MOSFET will switch-on. In this way the bootstrap capacitor will always be charged
and ready to supply the high-side floating driver. The oscillator waveforms are illustrated in
as well.
The dead-time Td equals the duration of the negative-going ramp of the oscillator sawtooth
plus an internal delay of 125 ns; hence it depends on the timing capacitor CT and the
resistor RT and is given by the approximate relationship:
Equation 5
There is an internal 325 ns limit to the minimum Td value, to make sure that no hazardous
condition of shoot-through can be generated, however it is recommended not to use
capacitor values lower than 220 pF.
))
1150
R
(
C
(
39
.
1
f
T
osc
+
≈
()
osc
d
SW
d
SW
d
SW
max
f
T
1
5
.
0
T
5
.
0
T
2
T
D
=
=
=
9
T
3
T
d
10
125
R
05
.
3
10
54
.
2
1
.
2
C
T
+
=
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| L6599TR | 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16 |
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參數(shù)描述 |
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