|
|
PDF HKT1117 Data sheet ( Hoja de datos )
| Número de pieza | HKT1117 | |
| Descripción | 1A LOW DROPOUT VOLTAGE REGULATOR | |
| Fabricantes | HOTTECH | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de HKT1117 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
|
No Preview Available !
1A LOW DROPOUT VOLTAGE REGULATOR
The HKT1117 series of adjustable and fixed voltage regulators are
designed to provide 1A output current and to operate down to 1V
input-to-output differential. The dropout voltage of the device is
guaranteed maximum 1.3V at maximum output current, decreasing at
lower load currents.
On-chip trimming adjusts the reference voltage to 1%. Current
limit is also trimmed, minimizing the stress under overload conditions
on both the regulator and power source circuitry.
The HKT1117 devices are pin compatible with other three-terminal
SCSI regulators and are offered in the low profile surface mount
SOT-223 package, in the TO-220 package and in the TO-252 (DPAK)
plastic package.
FEATURES
• Three Terminal Adjustable or Fixed Voltages*
1.5V, 1.8V, 2.5V, 2.85V, 3.3V and 5.0V
• Output Current of 1A
• Operates Down to 1V Dropout
• Line Regulation: 0.2% Max.
• Load Regulation: 0.4% Max.
• SOT-223, TO-252 and TO-220 package available
APPLICATIONS
• High Efficiency Linear Regulators
• Post Regulators for Switching Supplies
• 5V to 3.3V Linear Regulator
• Battery Chargers
• Active SCSI Terminators
• Power Management for Notebook
• Battery Powered Instrumentation
MAXIMUM RATINGS (TA=25℃ unless otherwise noted)
Symbol
VIN (Notes 1)
IOUT
TJ
ΘJA
ΘJA
ΘJA
PD
PD
PD
Description
Input Voltage
DC Output Current
Operating Junction Temperature Range
Thermal Resistance (SOT-223)
Thermal Resistance (TO-252)
Thermal Resistance (TO-220)
Maximum Power Dissipation (SOT-223)
Maximum Power Dissipation (TO-252)
Maximum Power Dissipation (SOT-220)
HKT1117
1. ADJ/GND
2. OUTPUT
3. INPUT
SOT-223
1. ADJ/GND
2. OUTPUT
3. INPUT
TO-220
1. ADJ/GND
2. OUTPUT
3. INPUT
TO-252
Max
15
PD/(VIN-VO)
-40 to 125
150
80
60
Internally Limited
Units
V
mA
°C
°C/W
°C/W
°C/W
mW
mW
mW
GUANGDONG HOTTECH INDUSTRIAL CO,. LTD.
Page:P7-P1
1 page  
1A LOW DROPOUT VOLTAGE REGULATOR
Output voltage adjustment
HKT1117
Like most regulators, the HTK1117 regulates the output by comparing the output voltage to an internally gen- erated
reference voltage. On the adjustable version as shown in Fig.4, the VREF is available externally as
1.25V between VOUT and ADJ. The voltage ratio formed by R1 and R2 should be set to conduct 10mA (mi- numum output
load).
The output voltage is given by the following equation:
On fixed versions of HKT1117, the voltage divider is provided internally
.
Input Bypass Capacitor
An input capacitor is recommended. A 10μF tantalum on the input is a suitable input bypassing for almost all applications.
Adjust Terminal Bypass Capacitor
The adjust terminal can be bypassed to ground with a bypass capacitor (CADJ) to improve ripple rejection. This bypass
capacitor prevents ripple from being amplified as the output voltage is increased. At any ripple frequency, the impedance
of the CADJ should be less than R1 to prevent the ripple from being amplified:
The R1 is the resistor between the output and the adjust pin. Its value is normally in the range of 100- 200Ω. For example,
with R1 = 124Ω and fRIPPLE = 120Hz, the CADJ should be > 11Μf
Output Capacitor
HKT1117 requires a capacitor from VOUT to GND to provide compensation feedback to the internal gain stage. This is to
ensure stability at the output terminal. Typically, a 10μF tantalum or 50μF aluminum electrolytic is sufficient.
Note: It is important that the ESR for this capacitor does not exceed 0.5 Ω.
The output capacitor does not have a theoretical upper limit and increasing its value will increase stability. COUT = 100μF or
more is typical for high current regulator design.
Load Regulation
When the adjustable regulator is used (Fig.5), the best load regulation is accomplished when the top of the resistor divider
(R1) is connected directly to the output pin of the HKT1117. When so connected, RP is not multiplied by the divider ratio.
For Fixed output version, the top of R1 is internally connected to the output and ground pins can be connected to low side of
the load.
GUANGDONG HOTTECH INDUSTRIAL CO,. LTD.
Page:P7-P5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet HKT1117.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HKT1117 | 1A LOW DROPOUT VOLTAGE REGULATOR | HOTTECH |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |