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参数资料
| 型号： | L6713ATR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 225 kHz SWITCHING FREQ-MAX, PQFP64 |
| 封装： | 10 X 10 MM, TQFP-64 |
| 文件页数： | 46/64页 |
| 文件大小： | 801K |
| 代理商： | L6713ATR |
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Oscillator
L6713A
50/64
19
Oscillator
L6713A embeds two/three phase oscillator with optimized phase-shift (180/120 phase-
shift) in order to reduce the input rms current and optimize the output filter definition.
The internal oscillator generates the triangular waveform for the PWM charging and
discharging with a constant current an internal capacitor. The switching frequency for each
channel, FSW, is internally fixed at 200 kHz so that the resulting switching frequency at the
load side results in being multiplied by N (number of phases).
The current delivered to the oscillator is typically 25
μA (corresponding to the free running
frequency FSW = 200 kHz) and it may be varied using an external resistor (ROSC) connected
between the OSC pin and SGND or VCC (or a fixed voltage greater than 1.24 V). Since the
OSC pin is fixed at 1.24 V, the frequency is varied proportionally to the current sunk (forced)
from (into) the pin considering the internal gain of 6 KHz/
μA.
In particular connecting ROSC to SGND the frequency is increased (current is sunk from the
pin), while connecting ROSC to VCC = 12 V the frequency is reduced (current is forced into
the pin), according the following relationships:
ROSC vs. SGND
ROSC vs. +12V
Maximum programmable switching frequency per phase must be limited to 1 MHz to avoid
minimum Ton limitation. Anyway, device power dissipation must be checked prior to design
high switching frequency systems.
Figure 24.
ROSC vs. switching frequency
F
SW
200 kHz
()
1.240V
R
OSC kΩ
()
---------------------------- 6
kHz
μA
-----------
+
200 kHz
() 7.422 10
3
R
OSC kΩ
()
-----------------------------
R
OSC kΩ
()
+
==
=
6
kHz
μA
-----------
200 kHz
() 7.422 10
3
R
OSC kΩ
()
-----------------------------
R
OSC kΩ
()
+
7.422 10
3
F
SW kHz
() 200 kHz
()
–
------------------------------------------------------------
==
k
Ω
[]
F
SW
200 kHz
() 12V 1.240V
–
R
OSC kΩ
()
------------------------------------
8kHz
μA
--------------
–
200 kHz
() 8.608 10
4
R
OSC kΩ
()
-----------------------------
–
R
OSC kΩ
()
2
--
==
=
kHz
μA
-----------
200 kHz
() 6.456 10
4
R
OSC kΩ
()
-----------------------------
–
R
OSC kΩ
()
8.608 10
4
200 kHz
() F
SW kHz
()
–
------------------------------------------------------------
==
k
Ω
[]
0
1000
2000
3000
4000
5000
6000
7000
25
50
75
100
125
150
175
200
Fsw [kHz] Programmed
Ro
sc
[
kOhm
s
]to
+
12V
0
50
100
150
200
250
300
350
400
150
250
350
450
550
650
750
850
950
1050
Fsw [kHz] Programmed
Ro
sc
[
kOhm
s
]t
o
S
G
N
D
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