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PDF HIP6002CB Data sheet ( Hoja de datos )
| Número de pieza | HIP6002CB | |
| Descripción | Rectifier (PWM) Controller and Output Voltage Monitor | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
HIP6002
March 2000 File Number 4270.2
Rectifier (PWM) Controller and Output
Voltage Monitor
The HIP6002 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 HIP6002 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 HIP6002 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% over temperature and
line voltage variations.
The HIP6002 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 HIP6002 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 HIP6002
protects against over-current conditions by inhibiting PWM
operation. Built-in over-voltage protection triggers an
external SCR to crowbar the input supply. The HIP6002
monitors the current by using the rDS(ON) of the upper
MOSFET which eliminates the need for a current sensing
resistor.
Pinout
HIP6002 (SOIC)
TOP VIEW
VSEN 1
OCSET 2
SS 3
VID0 4
VID1 5
VID2 6
VID3 7
EN 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
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
• 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
HIP6002CB
0 to 70 20 Ld SOIC
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.
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  
HIP6002
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.
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 HIP6002 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 and the enable (EN) pin. 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). With the EN pin held to VCC, 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.
The Power-On Reset (POR) function inhibits operation with
the chip disabled (EN pin low). With both input supplies
above their POR thresholds, transitioning the EN pin high
initiates a soft start interval.
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 with in ±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
5
5 Page 
HIP6002
+5V
VIN = OR
+12V
F1
0.1µF
L1 - 1µH
C1 - C4
4x 330µF
+12V
2N6394
2x 1µF
2K D1
0.1µF
10K 100pF
VCC OVP
EN 8
SS 3
VSEN 1
18 19
MONITOR
AND
PROTECTION
2 OCSET 1.1K
12 PGOOD
15 BOOT
RT 20
OSC
VID0 4
VID1 5
VID2 6 D/A
HIP6002
VID3 7
FB 10
+
-
9
-
+
14 UGATE
13 PHASE
17 LGATE
16 PGND
11
Q1
Q2
2.2nF
COMP
GND
8.2nF
20K
0.1µF
0.1µF
L0
3µH
D2 C15 - C21
7x 1000µF
1.33K
15
+VO
Component Selection Notes:
C15 - C21 each 1000µF 6.3W VDC, Sanyo MV-GX or Equivalent.
C1 - C4 each 330µF 25W VDC, Sanyo MV-GX or Equivalent.
L0 - 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 HIP6002CB.PDF ] | |
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