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PDF HIP6005B Data sheet ( Hoja de datos )
| Número de pieza | HIP6005B | |
| Descripción | Buck Pulse-Width Modulator (PWM) Controller and Output Voltage Monitor | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
HIP6005B
February 1999 File Number 4568.2
Buck Pulse-Width Modulator (PWM)
Controller and Output Voltage Monitor
The HIP6005B 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
HIP6005B 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 HIP6005B includes a fully
TTL-compatible 5-input digital-to-analog converter (DAC)
that adjusts the output voltage from 1.3VDC to 2.05VDC in
0.05V increments and from 2.1VDC to 3.5VDC in 0.1V steps.
The precision reference and voltage-mode regulator hold the
selected output voltage to within ±1% over temperature and
line voltage variations.
The HIP6005B 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 HIP6005B 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 HIP6005B
protects against over-current and over-voltage conditions by
inhibiting PWM operation. Additional built-in over-voltage
protection triggers an external SCR to crowbar the input
supply. The HIP6005B 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
PKG.
NO.
HIP6005BCB
0 to 70 20 Ld SOIC
M20.3
HIP6005BCV
0 to 70 20 Ld TSSOP
M20.173
NOTE: When ordering, use the entire part number. Add the suffix T
to obtain the TSSOP variant in tape and reel, e.g., HIP6005BCV-T.
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
• TTL-Compatible 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 2.05VDC
• 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, Pentium II,
PowerPC™, K6™, 6X86™ and Alpha™ Microprocessors
• High-Power 5V to 3.xV DC-DC Regulators
• Low-Voltage Distributed Power Supplies
Pinout
HIP6005B
(SOIC, TSSOP)
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
6X86™ is a trademark of Cyrix Corporation.
Alpha Micro™ is a trademark of Digital Computer Equipment Corporation
K6™ is a trademark of Advanced Micro Devices.
Pentium® is a registered trademark of Intel Corporation.
PowerPC™ is a registered trademark of IBM.
2-110
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
1 page  
HIP6005B
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. Output rising 15% more
than the DAC-set voltage triggers a high output on this pin
and disables PWM gate drive circuitry.
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-x---(--k-1---Ω0---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-x---(--k-1---Ω0---7--)
(RT to 12V)
Functional Description
Initialization
The HIP6005B 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.
4V
2V
0V
15A
10A
5A
0A
TIME (20ms/DIV.)
FIGURE 4. OVER-CURRENT OPERATION
2-114
5 Page 
HIP6005B
HIP6005B DC-DC Converter Application Circuit
Figure 11 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. Although the Application Note
details the HIP6005, the same evaluation platform can be
used to evaluate the HIP6005B. Intersil AnswerFAX
(407-724-7800) Doc. #99706.
+5V
VIN =
OR
+12V
F1
0.1µF
L1 - 1µH
CIN
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 D/A
7
8
10
HIP6005B
-
++
-
9
2.2nF
COMP
14 UGATE
13 PHASE
11
GND
0.1µF
Q1 L2
7µH
D2
COUT
9x 1000µF
8.2nF
20K
0.082µF
+VO
1K 20
Component Selection Notes
COUT - Each 1000µF 6.3WVDC, Sanyo MV-GX or Equivalent.
CIN - 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 11. PENTIUM PRO DC-DC CONVERTER
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time with-
out notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site http://www.intersil.com
Sales Office Headquarters
NORTH AMERICA
Intersil Corporation
P. O. Box 883, Mail Stop 53-204
Melbourne, FL 32902
TEL: (407) 724-7000
FAX: (407) 724-7240
EUROPE
Intersil SA
Mercure Center
100, Rue de la Fusee
1130 Brussels, Belgium
TEL: (32) 2.724.2111
FAX: (32) 2.724.22.05
ASIA
Intersil (Taiwan) Ltd.
7F-6, No. 101 Fu Hsing North Road
Taipei, Taiwan
Republic of China
TEL: (886) 2 2716 9310
FAX: (886) 2 2715 3029
2-120
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet HIP6005B.PDF ] | |
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