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参数资料
| 型号： | L6722 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, QCC36 |
| 封装： | 6 X 6 MM, 1 MM PITCH, VFQFPN-36 |
| 文件页数： | 19/34页 |
| 文件大小： | 421K |
| 代理商： | L6722 |
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10 Oscillator
L6722
26/34
10
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 varied
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 15. 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
Ro
sc
[
kOh
m
s
]to
S
G
N
D
相关PDF资料 |
PDF描述 |
|---|---|
| L6722TR | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, QCC36 |
| L9407F | SPECIALTY ANALOG CIRCUIT, PSFM8 |
| L9942 | STEPPER MOTOR CONTROLLER, PDSO36 |
| LA5681FN | SWITCHING CONTROLLER, 520 kHz SWITCHING FREQ-MAX, QCC48 |
| LB11620T | BRUSHLESS DC MOTOR CONTROLLER, 0.25 A, PDSO24 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| L6722TR | 功能描述:开关变换器、稳压器与控制器 3 Phase Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6725 | 功能描述:开关变换器、稳压器与控制器 Vltg Mode PWM Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6725_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:Voltage mode PWM controller with bootstrap anti-discharging system |
| L6725A | 功能描述:开关变换器、稳压器与控制器 Vltg Mode PWM Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| L6725ATR | 功能描述:开关变换器、稳压器与控制器 Step-Down Controller RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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