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参数资料
| 型号： | L6911C |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 1.3 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | SO-20 |
| 文件页数： | 16/20页 |
| 文件大小： | 370K |
| 代理商： | L6911C |
Obsolete
Product(s)
- Obsolete
Product(s)
5/20
L6911C
Table 1. VID Settings
Device Description
The device is an integrated circuit realized in BCD technology. It provides complete control logic and protections
for a high performance step-down DC-DC converter optimized for microprocessor power supply. It is designed
to drive N-Channel Mosfets in a synchronous-rectified buck topology. The device works properly with Vcc rang-
ing from 5V to 12V and regulates the output voltage starting from a 1.26V power stage supply voltage (Vin). The
output voltage of the converter can be precisely regulated, programming the VID pins, from 1.3V to 2.05V with
50mV binary steps and from 2.1V to 3.5V with 100mV binary steps, with a maximum tolerance of ±1% over tem-
perature and line voltage variations. The device provides voltage-mode control with fast transient response. It
includes a 200kHz free-running oscillator that is adjustable from 50kHz to 1MHz. The error amplifier features a
15MHz gain-bandwidth product and 10V/
sec slew rate which permits high converter bandwidth for fast tran-
sient performance. The resulting PWM duty cycle ranges from 0% to 100%. The device protects against over-
current conditions entering in HICCUP mode. The device monitors the current by using the rDS(ON) of the upper
MOSFET which eliminates the need for a current sensing resistor.
The device is available in SO20 package.
Oscillator
The switching frequency is internally fixed to 200kHz. The internal oscillator generates the triangular waveform
for the PWM charging and discharging with a constant current an internal capacitor. The current delivered to the
oscillator is typically 50
A (Fsw=200KHz) and may be varied using an external resistor (RT) connected between
RT pin and GND or VCC. Since the RT pin is maintained at fixed voltage (typ. 1.235V), the frequency is varied
proportionally to the current sunk (forced) from (into) the pin.
In particular connecting it to GND the frequency is increased (current is sunk from the pin), according to the
following relationship:
Connecting RT to VCC=12V or to VCC=5V the frequency is reduced (current is forced into the pin), according
to the following relationships:
VID4
VID3
VID2
VID1
VID0
Output
Voltage (V)
VID4
VID3
VID2
VID1
VID0
Output
Voltage (V)
01
11
1
1.30
11111
Output Off
01
11
0
1.35
11110
2.1
01
10
1
1.40
11101
2.2
01
10
0
1.45
11100
2.3
01
1
1.50
11011
2.4
01
0
1.55
11010
2.5
01
00
1
1.60
11001
2.6
01
00
0
1.65
11000
2.7
00
11
1
1.70
10111
2.8
00
11
0
1.75
10110
2.9
00
10
1
1.80
10101
3.0
00
10
0
1.85
10100
3.1
00
01
1
1.90
10011
3.2
00
01
0
1.95
10010
3.3
00
1
2.00
10001
3.4
00
0
2.05
10000
3.5
f
S
200kH z
4.94 10
6
R
T k
()
-------------------------
+
=
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相关代理商/技术参数 |
参数描述 |
|---|---|
| L6911CTR | 功能描述:DC/DC 开关控制器 5B PROGRAMMABLE STEP DOWN CONTROLLER RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6911D | 功能描述:DC/DC 开关控制器 5-Bit Prog Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6911DTR | 功能描述:DC/DC 开关控制器 5-Bit Prog Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6911E | 功能描述:DC/DC 开关控制器 5-Bit Prog Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| L6911E_07 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5-Bit programmable step down controller with synchronous rectification |
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