- 您现在的位置：买卖IC网 > PDF目录66268 > TC120503EHART 0.7 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO8 PDF资料下载
参数资料
| 型号： | TC120503EHART |
| 元件分类： | 稳压器 |
| 英文描述： | 0.7 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | SOP, 8 PIN |
| 文件页数： | 4/10页 |
| 文件大小： | 80K |
| 代理商： | TC120503EHART |
3
TC120
PWM/PFM STEP-DOWN COMBINATION
REGULATOR/CONTROLLER
TC120-1 7/27/99
PIN DESCRIPTION
Pin Number
Name
Description
1VIN
Unregulated Supply Input.
2
EXTW
Extended External Switching Transistor Drive Output. This output follows the timing on the
EXT output with an additional 100 nsec blanking time on both the leading and trailing edges.
That is, this output transitions from high-to-low 100 nsec
prior to the same transition on EXT;
and transitions low-to-high 100 nsec
after the same transition on EXT; resulting in a longer
external switch ON time. (
See Operation as a Regulator Controller for more information).
3
CPC
Charge Pump Capacitor Input. An inverting charge pump is formed by attaching a capacitor
and diode to this input (please see
Improving High Load Efficiency In Regulator Operating
Mode section).
4
SHDN/SS
Shutdown and Soft-Start Control Input. A soft start capacitor of 100 pF (min)
must be
connected to this input. The soft start capacitor is charged by an internal 1
A current source
that gently ramps the TC120 into service. Shutdown control is best implemented with an
external open collector (or open drain) switch. The TC120 enters shutdown when this input is
low. During shutdown, the regulator is disabled, and supply current is reduced to less than
2.5
A. Normal operation is restored when this input is open-circuited, and allowed to float
high. Please see
SHDN/SS section for details.
5
SENSE
Voltage Sense Input. This input must be connected to the output voltage node at the
physical location that requires the tightest voltage regulation.
6
GND
Ground Terminal.
7
EXT
External Switching Transistor Drive Output. This output connects directly to the gate of an
external P-channel MOSFET for applications requiring output currents greater than 600 mA.
The timing of this output exactly matches that of the gate drive for the internal P-channel
transistor. This output can drive a maximum capacitance of 1000 pF. (See
Operation as a
Regulator Controller for more information).
8LX
Inductor Terminal. This pin is connected to the drain of the internal P-channel switching
transistor. If the TC120 is operated as a regulator (i.e. using the internal switch); the inductor
must be connected between this pin and the SENSE pin.
DETAILED DESCRIPTION
The TC120 can be operated as an integrated step-down
regulator (using the internal switching transistor); or as a
step-down regulator controller (using an external switching
transistor). When operating as an integrated regulator, the
only required external components are a Shottky diode,
inductor and an output capacitor. Operating in this configu-
ration, the TC120 is capable of supporting output load
currents to a maximum of 600 mA with operating efficiencies
above 85%. (Efficiencies at high loads can be further im-
proved by using the on-board charge pump circuit to pull the
gate of the internal switching transistor below ground for the
lowest possible ON resistance. For more information, see
Improving High Load Efficiency in Regulator Operating
Mode section).
Higher output currents are achieved by operating the
TC120 with an external P-Channel switching transistor
(
Controller mode). In this operating configuration, the maxi-
mum output current is determined primarily by the ON
resistance of the P-Channel switch and the series resis-
tance of the inductor.
Inductor Selection
Selecting the proper inductor value is a trade-off be-
tween physical size and power conversion requirements.
Lower value inductors cost less, but result in higher ripple
current and core losses. They are also more prone to
saturate since the coil current ramps faster and could
overshoot the desired peak value. This not only reduces
efficiency, but could also cause the current rating of the
Figure 1. Test Circuit
TC120xx03
VIN
EXTW
CPC
SHDN/SS
LX
EXT
GND
SENSE
47
F/10V
Tantalum
CSS
4.7 nF
IN5817
L1
22
H
VOUT
VIN
COUT
47
F/10V
Tantalum
相关PDF资料 |
PDF描述 |
|---|---|
| TC120303EHART | 0.7 A SWITCHING REGULATOR, 345 kHz SWITCHING FREQ-MAX, PDSO8 |
| TC1219ECHRT | SWITCHED CAPACITOR CONVERTER, 20 kHz SWITCHING FREQ-MAX, PDSO6 |
| TC1220ECHRT | SWITCHED CAPACITOR CONVERTER, 56.3 kHz SWITCHING FREQ-MAX, PDSO6 |
| TC1220ECH | 0.05 A SWITCHED CAPACITOR CONVERTER, 56.3 kHz SWITCHING FREQ-MAX, PDSO6 |
| TC1221ECHRT | 0.05 A SWITCHED CAPACITOR CONVERTER, 169 kHz SWITCHING FREQ-MAX, PDSO6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC120503EHATR | 功能描述:开关变换器、稳压器与控制器 PWM/PFM Step-Down 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 |
| TC1207D-100M | 制造商:PRODUCTWELL 制造商全称:PRODUCTWELL 功能描述:TOROID INDUCTORS |
| TC1207D-320M | 制造商:PRODUCTWELL 制造商全称:PRODUCTWELL 功能描述:TOROID INDUCTORS |
| TC1210A | 制造商:Thomas & Betts 功能描述:Fittings Connector 4inch Steel |
| TC12-11CGKWA | 制造商:Kingbright Corporation 功能描述:DOT MATRIX 1.2" CMN CATHODE GREEN 制造商:Kingbright Corporation 功能描述:DOT MATRIX, 1.2" CMN CATHODE, GREEN 制造商:Kingbright Corporation 功能描述:DOT MATRIX, 1.2" CMN CATHODE, GREEN; Display Dots x Lines:5 x 7; LED Color:Green; Luminous Intensity:73mcd; LED Display Type:Dot Matrix; Peak Wavelength:574nm; Forward Voltage:2.1V; Display Size:22.9mm x 39mm ;RoHS Compliant: Yes |
发布紧急采购，3分钟左右您将得到回复。