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PDF HIP6008CB Data sheet ( Hoja de datos )
| Número de pieza | HIP6008CB | |
| Descripción | Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
HIP6008
March 2000 File Number 4281.2
Buck Pulse-Width Modulator (PWM)
Controller and Output Voltage Monitor
The HIP6008 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
HIP6008 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 HIP6008 includes a 4-Input Digital-
to-Analog Converter (DAC) that adjusts the output voltage
from 2.0VDC to 3.5VDC in 0.1V increments. The precision
reference and voltage-mode regulator hold the selected
output voltage to within ±1.5% over temperature and line
voltage variations.
The HIP6008 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 HIP6008 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 HIP6008
protects against over-current conditions by inhibiting PWM
operation. Built-in over-voltage protection triggers an
external SCR to crowbar the input supply. The HIP6008
monitors the current by using the rDS(ON) of the upper
MOSFET which eliminates the need for a current sensing
resistor.
Pinout
HIP6008
(SOIC)
TOP VIEW
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
- ±1.5% Over Line Voltage and Temperature
• 4 Bit Digital-to-Analog Output Voltage Selection
- Wide Range . . . . . . . . . . . . . . . . . . .2.0VDC to 3.5VDC
- 0.1V Binary Steps
• Power-Good Output Voltage Monitor
• Over-Voltage and Over-Current Fault Monitors
- Does Not Require Extra Current Sensing Element
- Uses MOSFET’s 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
Ordering Information
TEMP.
PART NUMBER RANGE (oC)
PACKAGE
HIP6008CB
0 to 70 16 Ld SOIC
PKG.
NO.
M16.15
OCSET 1
SS 2
VID0 3
VID1 4
VID2 5
VID3 6
COMP 7
FB 8
16 VSEN
15 RT/OVP
14 VCC
13 BOOT
12 UGATE
11 PHASE
10 PGOOD
9 GND
Alpha™ is a trademark of Digital Equipment Corporation.
Pentium® is a registered trademark of Intel Corporation.
PowerPC™ is a trademark of IBM.
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  
HIP6008
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)
The second function for this pin is to drive an external SCR
in the event of an overvoltage condition.
VSEN (Pin 16)
This pin is connected to the converters output voltage. The
PGOOD and OVP comparator circuits use this signal to
report output voltage status and for overvoltage protection.
Functional Description
Initialization
The HIP6008 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 MOSFET’s on-resistance,
rDS(ON) to monitor the current. This method enhances the
converter’s efficiency and reduces cost by eliminating a
current sensing resistor.
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 referenced to VIN) exceeds the voltage
across ROCSET, the over-current function initiates a soft-
start sequence. The soft-start function discharges CSS with
a 10µA current sink and inhibits PWM operation. The soft-
start function recharges CSS, and PWM operation resumes
with the error amplifier clamped to the SS voltage. Should an
overload occur while recharging CSS, the soft start function
inhibits PWM operation while fully charging CSS to 4V to
complete its cycle. Figure 4 shows this operation with an
overload condition. Note that the inductor current increases
to over 15A during the CSS charging interval and causes an
over-current trip. The converter dissipates very little power
with this method. The measured input power for the
conditions of Figure 4 is 2.5W.
5
5 Page 
HIP6008
HIP6008 DC-DC Converter Application Circuit
The figure below 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 AN9664. AN9664 details the
HIP6003EVAL1 evaluation board. The HIP6008 is pin-for-pin
compatible with the HIP6003 and can be evaluated in the
HIP6003EVAL1 board. See Intersil’s home page on the web:
www.intersil.com or Intersil AnswerFAX (321-724-7800)
document #99664.
VIN =
+5V
OR
+12V
F1
15A
VSS
R1
SPARE
C13
0.1µF
VID0
VID1
VID2
VID3
L1
1.5µH
C1-C4
4x 330µF
Q2
2N6394
+12V
R6
CR1
C19-C20
2x 1µF
VR1
5.1V
C14
R9 0.1µF
10K
10
VCC
14
C18 4148
1µF
C21
1000pF
1 OCSET R7
SS 2
RT/OVP 15
MONITOR AND
PROTECTION
10 PGOOD 1.1K
13 BOOT
12 UGATE
Q1
VID0
VID1
VID2
VID3
OSC
3
4
5 D/A
6
U1
-
+
11 PHASE
16 VSEN
CR2
FB 8
+
-
HIP6008
R2
750k
79
C15 COMP
GND
C22
0.1µF
L2
7µH
C5-C12
8x 1000µF
33pF
C16 R5
R8
20K
1000pF 90.9K
C17
R3
3.01K
SPARE
R4
SPARE
R10
15K
C24
Component Selection Notes:
C5-C12 -8 each 1000µF 6.3W VDC, Sanyo MV-GX or Equivalent
C1-C4 -4 each 330µF 25W VDC, Sanyo MV-GX or Equivalent
L1 -Core: Micrometals T60-52; Each Winding: 14 Turns of 17AWG
L2 -Core: Micrometals T44-52; Winding: 7 Turns of 18AWG
CR1 -1N4148 or Equivalent
CR2 -25A, 35V Schottky, Motorola MBR2535CTL or Equivalent
Q1 -Intersil MOSFET; RFP70N03
FIGURE 12. PENTIUM PRO DC-DC CONVERTER
0.1µF
PWRGD
VOUT
VSS
11
11 Page | ||
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| PDF Descargar | [ Datasheet HIP6008CB.PDF ] | |
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