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PDF HIP6004B Data sheet ( Hoja de datos )
| Número de pieza | HIP6004B | |
| Descripción | Buck and Synchronous-Rectifier (PWM) Controller and Output Voltage Monitor | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
HIP6004
March 2000
File Number 4275.2
[ /Title
(HIP60
04)
/Sub-
ject
(Buck
and
Syn-
chro-
nous-
Recti-
fier
(PWM
)Con-
troller
and
Out-
put
Volt-
age
Moni-
tor)
/Autho
r ()
/Key-
words
(Inter-
sil
Corpo-
ration,
Intelli-
gent
Power,
Com-
puter
Power,
Pen-
tium
Power,
Buck and Synchronous-Rectifier (PWM)
Controller and Output Voltage Monitor
The HIP6004 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
topology. The HIP6004 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 HIP6004 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 HIP6004 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 HIP6004 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 HIP6004
protects against over-current conditions by inhibiting PWM
operation. Built-in over-voltage protection triggers an
external SCR to crowbar the input supply. The HIP6004
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
HIP6004CB
0 to 70 20 Ld SOIC
This data sheet describes a pre-released product.
PKG.
NO.
M20.3
Alpha Micro™ is a trademark of Digital Computer Equipment Corporation.
Pentium® is a registered trademark of Intel Corporation.
PowerPC™ is a registered trademark of IBM.
Features
• Drives Two N-Channel MOSFETs
• 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 Step. . . . . . . . . . . . . . . 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
HIP6004
(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 LGATE
16 PGND
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 1-888-468-3774 | Copyright © Intersil Corporation 2000
1 page  
HIP6004
PGND (Pin 16)
This is the power ground connection. Tie the lower MOSFET
source to this pin.
LGATE (Pin 17)
Connect LGATE to the lower MOSFET gate. This pin
provides the gate drive for the lower MOSFET.
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 HIP6004 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
The over-current function cycles the soft-start function in a
hiccup mode to provide fault protection. A resistor (ROCSET)
programs the over-current trip level. An internal 200μA current
sink develops a voltage across ROCSET that is referenced to
VIN. When the voltage across the upper MOSFET (also
5
5 Page 
HIP6004
HIP6004 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 AN9672.
+5V
VIN =
OR
+12V
F1 L1 - 1μH
C1
5x 1000μF
+12V
2N6394
2x 1μF
0.1μF
0.1μF
SS 3
VSEN 1
2K D1
VCC
18
OVP
19
MONITOR
AND
PROTECTION
1000pF
2 OCSET
12 PGOOD
15 BOOT
1K
RT
VID0
VID1
VID2
VID3
VID4
FB
20 OSC
4
5
6
7
D/A
8
10
HIP6004
+- +-
9
2.2nF
COMP
8.2nF
20K
14 UGATE
13 PHASE
17 LGATE
16 PGND
11
GND
Q1
Q2
0.1μF
0.1μF
L2
3μH
D2 CO
9x 1000μF
+VO
1.33K
15
Component Selection Notes;
C0 - 9 Each 1000μF 6.3W VDC, Sanyo MV-GX or Equivalent
C1 - 5 Each 330μF 25W VDC, Sanyo MV-GX or Equivalent
L2 - Core: Micrometals T50-52B; Each Winding: 10 Turns of 16AWG
L1 - Core: Micrometals T50-52; Winding: 5 Turns of 18AWG
D1 - 1N4148 or Equivalent
D2 - 3A, 40V Schottky, Motorola MBR340 or Equivalent
Q1, Q2 - Intersil MOSFET; RFP70N03
FIGURE 12. PENTIUM PRO DC-DC CONVERTER
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet HIP6004B.PDF ] | |
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