|
|
PDF HT82P604B Data sheet ( Hoja de datos )
| Número de pieza | HT82P604B | |
| Descripción | DC-DC Converter | |
| Fabricantes | Holtek Semiconductor Inc | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de HT82P604B (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
|
No Preview Available !
Preliminary
HT82P604B
DC-DC Converter
Features
· Operating voltage: 5V~12V
· Drives two N-Channel MOSFETs
· Simple single-loop control design
- Voltage-mode PWM control
· Fast transient response
- High-bandwidth error amplifier
- Full 0% to 100% duty ratio
· Excellent output voltage regulation
- ±1% over line voltage and temperature
· 5 bit digital-to-analog output voltage selection
- Wide range -1.3V to 3.5V
- 0.1V binary steps from 2.1V to 3.5V
- 0.05V binary steps from 1.3V to 2.05V
· Power-good output voltage monitor
· Over-voltage and over-current sensing ele-
ment, uses MOSFET¢s rDS (ON)
· Small converter size
- Constant frequency operation
- 200kHz free-running oscillator program-
mable from 50kHz to over 1MHz
Applications
· Power supply for PentiumTM, PentiumTM
Pro, PowerPCTM and AlphaTM Microproces-
sors
· High-power5Vto3.xVDC-DCregulators
· Low-voltage distributed power supplies
General Description
The HT82P604B provides complete control and
protection for a DC-DC converter optimized for
high performance microprocessor applications.
It is designed to drive two N-Channel
MOSFETs in a synchronous-rectified buck to-
pology. The HT82P604B integrates all of the
control, output adjustment, monitoring and
protection functions into a single package.
The output voltage of the converter is easily ad-
justed and precisely regulated. The HT82P604B
includes a 5-input digital-to-analog converter
(DAC) that adjusts the output voltage from 2.1V
to 3.5V in 0.1V increments and from 1.3V to
2.05V in 0.05V steps. The precision reference
and voltage-mode regulator hold the selected
output voltage to within ±1% over temperature
and line voltage variations.
The HT82P604B provides simple, single feed-
back loop, voltage-mode control with fast tran-
sient response. It includes a 200kHz
free-running triangle-wave oscillator that is
adjustable from below 50kHz to over 1MHz.
The error amplifier features a 15MHz
gain-bandwidth product and 6V/ms slew rate
which enables high converter bandwidth for
fast transient performance. The resulting
PWM duty ratio ranges from 0% to 100%.
The HT82P604B monitors the output voltage
with a window comparator that tracks the DAC
output and issues a Power Good signal when
the output is within ±10%. The HT82P604B
protects against over-current conditions by in-
hibiting PWM operation. Built-in over-voltage
protection triggers an external SCR to crowbar
the input supply. The HT82P604B monitors the
current by using the rDS (ON) of the upper
MOSFET which eliminates the need for a cur-
rent sensing resistor.
Pentium is a trademark of Intel Corporation
1
March 23, 2000
1 page  
Preliminary
HT82P604B
Symbol
Parameter
VPGOOD
Lower Threshold
(VSEN/DACOUT)
Hysteresis
(VSEN/DACOUT)
PGOOD Voltage Low
Test Conditions
VCC
Conditions
12V VSEN Falling
12V
Upper and Lower
Threshold
12V IPGOOD=-5mA
Min. Typ. Max. Unit
89 ¾ 94
¾2¾
¾ 0.5 ¾
%
%
V
Functional Description
Output voltage program
The output voltage of a HT82P604B converter
is programmed to discrete levels between 1.3V
and 3.5V. The voltage identification (VID) pins
program an internal voltage reference
(DACOUT) with a 5-bit digital-to-analog con-
verter (DAC). The level of DACOUT also sets
the PGOOD and OVP thresholds. Table 1 speci-
fies the DACOUT voltage for the 32 combina-
tions of open or short connections on the VID
pins. The output voltage should not be adjusted
while the converter is delivering power. Re-
move input power before changing the output
voltage. Adjusting the output voltage during
operation could toggle the PGOOD signal and
exercise the overvoltage protection.
Pin Name
Nominal
Output
VID4 VID3 VID2 VID1 VID0 Voltage
Dacout
01111
1.30
01110
1.35
01101
1.40
01100
1.45
01011
1.50
01010
1.55
01001
1.60
01000
1.65
00111
1.70
00110
1.75
00101
1.80
Pin Name
Nominal
Output
VID4 VID3 VID2 VID1 VID0 Voltage
Dacout
00100
1.85
00011
1.90
00010
1.95
00001
2.00
00000
2.05
11111
0
11110
2.1
11101
2.2
11100
2.3
11011
2.4
11010
2.5
11001
2.6
11000
2.7
10111
2.8
10110
2.9
10101
3.0
10100
3.1
10011
3.2
10010
3.3
10001
3.4
10000
3.5
Note: 0=connected to GND or VSS, 1=OPEN
Table 1 Output voltage program
5 March 23, 2000
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet HT82P604B.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HT82P604B | DC-DC Converter | Holtek Semiconductor Inc |
| 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 |