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参数资料
| 型号： | L6701 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 110 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封装： | LEAD FREE, SSO-36 |
| 文件页数： | 28/44页 |
| 文件大小： | 627K |
| 代理商： | L6701 |
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Obsolete
Product(s)
- Obsolete
Product(s)
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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| L6709TR | 功能描述:功率驱动器IC 6-Bit Dual Ph Contlr RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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