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參數(shù)資料
| 型號： | L6701TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | LEAD FREE, SSO-36 |
| 文件頁數(shù)： | 28/44頁 |
| 文件大小： | 627K |
| 代理商： | L6701TR |
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14 Oscillator
L6701
34/44
14
Oscillator
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 100kHz so that the resulting switching frequency at the load
side results in being tripled (300kHz).
The current delivered to the oscillator is typically 25
A (corresponding to the free-running
frequency FSW=100kHz) and it may be varied using an external resistor (ROSC) connected
between the OSC pin and SGND. Since the OSC pin is fixed at 1.24V, the frequency is
increased proportionally to the current sunk from the pin considering the internal gain of 4KHz/
A.
In particular connecting ROSC to SGND the frequency is increased according to the following
relationship:
ROSC vs. SGND
Caution:
Maximum programmable switching frequency per phase must be limited to 500kHz to avoid
current reading errors causing, as a consequence, current sharing errors. Anyway, device
power dissipation must be checked prior to design high switching frequency systems.
Figure 16. ROSC vs. Switching Frequency
F
SW
100kHz
1.240V
R
OSC k
()
---------------------------- 4
kHz
A
-----------
+
100kHz
4.96 10
6
R
OSC k
()
----------------------------
+
==
0
50
100
150
200
250
100
150
200
250
300
350
400
450
500
550
Fsw [kHz] Programmed
R
o
s
c
[k
O
h
m
s
]to
SG
N
D
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