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PDF HIP6005 Data sheet ( Hoja de datos )
| Número de pieza | HIP6005 | |
| Descripción | Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
HIP6005
March 2000 File Number 4276.2
Buck Pulse-Width Modulator (PWM)
Controller and Output Voltage Monitor
The HIP6005 provides complete control and protection for a
DC-DC converter optimized for high-performance
microprocessor applications. It is designed to drive an
N-Channel MOSFET in a standard buck topology. The
HIP6005 integrates all of the control, output adjustment,
monitoring and protection functions into a single package.
The output voltage of the converter is easily adjusted and
precisely regulated. The HIP6005 includes a 5-input digital-
to-analog converter (DAC) that adjusts the output voltage
from 2.1VDC to 3.5VDC in 0.1V increments and from 1.3VDC
to 2.1VDC 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 HIP6005 provides simple, single feedback loop, voltage-
mode control with fast transient 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/µs slew rate which
enables high converter bandwidth for fast transient
performance. The resulting PWM duty ratio ranges from 0% to
100%.
The HIP6005 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 HIP6005
protects against over-current conditions by inhibiting PWM
operation. Built-in over-voltage protection triggers an
external SCR to crowbar the input supply. The HIP6005
monitors the current by using the rDS(ON) of the upper
MOSFET which eliminates the need for a current sensing
resistor.
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
HIP6005CB
0 to 70 20 Ld SOIC
PKG.
NO.
M20.3
Alpha™ is a trademark of Digital Equipment Corporation.
Pentium® is a registered trademark of Intel Corporation.
PowerPC™ is a trademark of IBM.
Features
• Drives N-Channel MOSFET
• Operates from +5V or +12V Input
• 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 . . . . . . . . . . . . . . . . . . . 1.3VDC to 3.5VDC
- 0.1V Binary Steps . . . . . . . . . . . . . . . 2.1VDC to 3.5VDC
- 0.05V Binary Steps . . . . . . . . . . . . . . 1.3VDC to 2.1VDC
• Power-Good Output Voltage Monitor
• Over-Voltage and Over-Current Fault Monitors
- Does Not Require Extra Current Sensing Element,
Uses MOSFETs rDS(ON)
• Small Converter Size
- Constant Frequency Operation
- 200kHz Free-Running Oscillator Programmable from
50kHz to over 1MHz
Applications
• Power Supply for Pentium®, Pentium Pro, PowerPC™ and
Alpha™ Microprocessors
• High-Power 5V to 3.xV DC-DC Regulators
• Low-Voltage Distributed Power Supplies.
Pinout
HIP6005
(SOIC)
TOP VIEW
VSEN 1
OCSET 2
SS 3
VID0 4
VID1 5
VID2 6
VID3 7
VID4 8
COMP 9
FB 10
20 RT
19 OVP
18 VCC
17 NC
16 NC
15 BOOT
14 UGATE
13 PHASE
12 PGOOD
11 GND
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 2000
1 page  
HIP6005
BOOT (Pin 15)
This pin provides bias voltage to the upper MOSFET driver.
A bootstrap circuit may be used to create a BOOT voltage
suitable to drive a standard N-Channel MOSFET.
NC (Pin 16)
No connection.
NC (Pin 17)
No connection.
VCC (Pin 18)
Provide a 12V bias supply for the chip to this pin.
OVP (Pin 19)
The OVP pin can be used to drive an external SCR in the
event of an overvoltage condition.
RT (Pin 20)
This pin provides oscillator switching frequency adjustment.
By placing a resistor (RT) from this pin to GND, the nominal
200kHz switching frequency is increased according to the
following equation:
Fs ≈ 200kHz + R--5---T-•---(--1k---0-Ω---6--)
(RT to GND)
Conversely, connecting a pull-up resistor (RT) from this pin
to VCC reduces the switching frequency according to the
following equation:
Fs ≈ 200kHz – -R-4---T-•---(--1k---0-Ω---7--)
(RT to 12V)
Functional Description
Initialization
The HIP6005 automatically initializes upon receipt of power.
Special sequencing of the input supplies is not necessary.
The Power-On Reset (POR) function continually monitors
the input supply voltages. The POR monitors the bias
voltage at the VCC pin and the input voltage (VIN) on the
OCSET pin. The level on OCSET is equal to VIN less a fixed
voltage drop (see over-current protection). The POR function
initiates soft start operation after both input supply voltages
exceed their POR thresholds. For operation with a single
+12V power source, VIN and VCC are equivalent and the
+12V power source must exceed the rising VCC threshold
before POR initiates operation.
Soft Start
The POR function initiates the soft start sequence. An
internal 10µA current source charges an external capacitor
(CSS) on the SS pin to 4V. Soft start clamps the error
amplifier output (COMP pin) and reference input (+ terminal
of error amp) to the SS pin voltage. Figure 3 shows the soft
start interval with CSS = 0.1µF. Initially the clamp on the error
amplifier (COMP pin) controls the converter’s output voltage.
At t1 in Figure 3, the SS voltage reaches the valley of the
oscillator’s triangle wave. The oscillator’s triangular
waveform is compared to the ramping error amplifier voltage.
This generates PHASE pulses of increasing width that
charge the output capacitor(s). This interval of increasing
pulse width continues to t2. With sufficient output voltage,
the clamp on the reference input controls the output voltage.
This is the interval between t2 and t3 in Figure 3. At t3 the SS
voltage exceeds the DACOUT voltage and the output
voltage is in regulation. This method provides a rapid and
controlled output voltage rise. The PGOOD signal toggles
‘high’ when the output voltage (VSEN pin) is within ±5% of
DACOUT. The 2% hysteresis built into the power good
comparators prevents PGOOD oscillation due to nominal
output voltage ripple.
PGOOD
(2V/DIV.)
0V
SOFT-START
(1V/DIV.)
OUTPUT
VOLTAGE
(1V/DIV.)
0V
0V
t1 t2 t3
TIME (5ms/DIV.)
FIGURE 3. SOFT START INTERVAL
Over-Current Protection
The over-current function protects the converter from a
shorted output by using the upper MOSFETs on-resistance,
rDS(ON) to monitor the current. This method enhances the
converter’s efficiency and reduces cost by eliminating a
current sensing resistor.
4V
2V
0V
15A
10A
5A
0A
TIME (20ms/DIV.)
FIGURE 4. OVER-CURRENT OPERATION
5
5 Page 
HIP6005
HIP6005 DC-DC Converter Application Circuit
Figure 12 shows an application circuit of a DC-DC Converter
for an Intel Pentium Pro microprocessor. Detailed
information on the circuit, including a complete Bill-of-
Materials and circuit board description, can be found in
application note AN9706.
+5V
VIN = OR
+12V
F1
0.1µF
L1 - 1µH
C1
5x 1000µF
+12V
2N6394
2x 1µF
0.1µF
2K D1
SS 3
VSEN 1
VCC
18
OVP
19
MONITOR
AND
PROTECTION
1000pF
2 OCSET 1.1K
12 PGOOD
15 BOOT
RT 20
OSC
VID0
VID1
VID2
VID3
VID4
FB
4
5
6
7
D/A
8
10
HIP6005
-
++
-
9
2.2nF
COMP
14 UGATE
13 PHASE
11
GND
0.1µF
Q1
L2
7µH
D2
C0
9x 1000µF
8.2nF
20K
0.082µF
1K 20
+VO
Component Selection Notes;
C0 - C9 Each 1000µF 6.3WVDC, Sanyo MV-GX or Equivalent
C1 - C5 Each 330µF 25WVDC, Sanyo MV-GX or Equivalent
L2 - Core: Micrometals T60-52; Each Winding: 14 Turns of 17AWG
L1 - Core: Micrometals T50-52; Winding: 6 Turns of 18AWG
D1 - 1N4148 or Equivalent
D2 - 25A, 35V Schottky, Motorola MBR2535CTL or Equivalent
Q1 - Intersil MOSFET; RFP70N03
FIGURE 12. PENTIUM PRO DC-DC CONVERTER
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet HIP6005.PDF ] | |
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