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PDF ISL8107 Data sheet ( Hoja de datos )
| Número de pieza | ISL8107 | |
| Descripción | Single-Phase Pulse-Width Modulation (PWM) Controller | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
Single-Phase Pulse-Width Modulation
(PWM) Controller with Integrated
www.dHatiagshhe-eSt4iud.ceomGate Drivers
The ISL8107 is a single phase, non-synchronous buck
controller with an integrated high-side MOSFET driver. The
controller operates from 9V to 75V input voltage range. The
internal 1.192V reference voltage has a tolerance of ±1%
over the industrial temperature range.
The ISL8107 employs voltage-mode control with
feedforward compensation to provide optimal transient
response and a constant loop gain over a wide input voltage
range. The switching frequency can be programmed from
100kHz to 600kHz by external resistor and capacitor. The
switching frequency can be synchronized to an external
clock signal through the SYNC pin.
The ISL8107 features programmable soft-start, hiccup mode
for short circuit protection, and over-temperature protection.
The overcurrent protection is implemented using MOSFET’s
rDS(ON) sensing. This approach simplifies the implementation
without deteriorating the converter efficiency.
Pinout
ISL8107
(16 LD 5X5 QFN)
TOP VIEW
16 15 14 13
VFF 1
12 EN/SS
OCSET 2
11 PGND
VCC 3
10 PGOOD
SYNC 4
9 VBG
5678
ISL8107
December 11, 2007
FN6605.0
Features
• Operates from +9V to +75V Bias Supply Voltage
• +1.192V Internal Voltage Reference
- ±1% tolerance Over the Industrial Temperature Range
• Programmable Switching Frequency 100kHz to 600kHz
• Simple Single-Loop Voltage Mode Control
• Voltage Feedforward Compensation
• Switching Frequency Synchronization
• Lossless, Programmable Overcurrent Protection
- Uses MOSFET’s rDS(ON)
- Hiccup Mode
• Integrated N-Channel MOSFET Gate Drivers
• Programmable Soft-Start
• Over-Temperature Protection
• QFN (5x5) Package
- QFN compliant to JEDEC PUB95 MO-220 QFN - Quad
Flat No Leads - Product Outline
- QFN Near Chip Scale Package Footprint; Improves
PCB Efficiency, Thinner in Profile
• Pb-free (RoHS compliant)
Applications
• Test and Measurement Instruments
• Routers and Switchers
• Point of Load Modules
• Distributed DC/DC Power Architecture
• Industrial Applications
• Telecom/Datacom Applications
Ordering Information
PART
NUMBER
(Note)
PART
TEMP.
PACKAGE PKG.
MARKING RANGE (°C) (Pb-Free) DWG. #
ISL8107IRZ ISL8107 IRZ -40 to +85 16 Ld 5x5 QFN L16.5x5B
ISL8107IRZ-T* ISL8107 IRZ -40 to +85 16 Ld 5x5 QFN L16.5x5B
Tape and Reel
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special
Pb-free material sets; molding compounds/die attach materials and
100% matte tin plate PLUS ANNEAL - e3 termination finish, which is
RoHS compliant and compatible with both SnPb and Pb-free soldering
operations. Intersil Pb-free products are MSL classified at Pb-free peak
reflow temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL8107
Absolute Maximum Ratings
Input Voltage (VCC,VFF) to GND . . . . . . . . . . . . . . . . . . . . . . .100V
BOOT to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105V
ENSS pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V
FB, COMP, SYNC pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8V
ESD Rating
Human Body Model (Per MIL-STD-883 Method 3015.7) . . . . .2kV
www.daMCtahasachrhegieneted4uMD.ecoovdimecle(PMeordEeIlA(PJ eErDE-O47S0/1ESMDetDhoSd5.C3,-141/11)4./9. 3. ).
.
.
.
.
.
.
.200V
. .1kV
ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Thermal Information
Thermal Resistance (Typical)
θJA (°C/W) θJC (°C/W)
QFN Package (Notes 1, 2) . . . . . . . .
33
3
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . .-65°C to +150°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . 9.0V to 75V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
1. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
2. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
3. Limits should be considered typical and are not production tested.
Electrical Specifications Recommended Operating Conditions, unless otherwise noted.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
VCC SUPPLY
Bias Voltage Range
9.0 - 75
Bias Supply Current
IVCC
VCC Shutdown Current
IVCC_SD
INTERNAL LINEAR REGULATOR (PVCC)
UGATE open
VCC = 48V, ENSS = 0V
- 23
- 40 60
Output Voltage
PVCC VCC = 15V to 75V, Load = 3mA to 20mA
-
10
-
Maximum Output Current
20 -
-
Short Current Protection
- 60 -
POWER-ON RESET
POR Threshold
VCC = VFF
6.8 7.8 8.5
POR Threshold Hysteresis
VCC = VFF
- 220 -
OSCILLATOR
Total Variation on Set Frequency
Frequency Range
SYNC Frequency Range
Ramp Amplitude
Min OFF Time
RT=20kΩ, CT=1200pF
330
Set by RT and CT. RT range = 20k to 100k, 100 - 600
CT range = 470pF to 1200pF
above RTCT natural frequency
100 - 600
ΔVOSC VCC varied from 9.0V to 75V
- 0.11*VFF -
- 190 300
REFERENCE VOLTAGE
Feedback Voltage
Accuracy
VFB
- 1.192 -
-1.0 - +1.0
UNITS
V
mA
µA
V
mA
mA
V
mV
kHz
kHz
kHz
VP-P
ns
V
%
5 FN6605.0
December 11, 2007
5 Page 
ISL8107
If overcurrent is detected, the output immediately shuts off, it
cycles the soft-start function in a hiccup mode (4 dummy
soft-start time-outs, then up to one real one) to provide fault
protection. If the shorted condition is not removed, this cycle
will continue indefinitely.
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EENNSSSS
IILL
FIGURE 12. TYPICAL OVERCURRENT PROTECTION
ENSS
VVOUUTT
ILL
FIGURE 13. TYPICAL HICCUP RECOVER
Thermal Protection
If the ISL8107 IC junction temperature reaches a nominal
temperature of +150°C, the controller will be disabled. The
ISL8107 will not be re-enabled until the junction temperature
drops below +110°C.
Power-Good
The PGOOD comparator monitors the voltage on the FB pin.
PGOOD is asserted (open drain) when the FB pin voltage is
within 14% of the reference voltage. The turn-on response of
the PGOOD circuit has a typical 3µs delay. The PGOOD is
deasserted under disable, overcurrent event, or
over-temperature event.
Component Selection Guidelines
Output Capacitor Selection
An output capacitor is required to filter the output and supply
the load transient current. The filtering requirements are a
function of the switching frequency and the ripple current.
The load transient requirements are a function of the slew
rate (di/dt) and the magnitude of the transient load current.
These requirements are generally met with a mix of
capacitors and careful layout.
For applications that have transient load rates above 1A/ns,
high frequency capacitors initially supply the transient and
slow the current load rate seen by the bulk capacitors. The
bulk filter capacitor values are generally determined by the
ESR (effective series resistance) and voltage rating
requirements rather than actual capacitance requirements.
High frequency decoupling capacitors should be placed as
close to the power pins of the load as physically possible. Be
careful not to add inductance in the circuit board wiring that
could cancel the usefulness of these low inductance
components. Consult with the manufacturer of the load on
specific decoupling requirements.
Use only specialized low-ESR capacitors intended for
switching-regulator applications for the bulk capacitors.
The bulk capacitor’s ESR will determine the output ripple
voltage and the initial voltage drop after a high slew-rate
transient. An aluminum electrolytic capacitor's ESR value is
related to the case size with lower ESR available in larger
case sizes. However, the equivalent series inductance
(ESL) of these capacitors increases with case size and can
reduce the usefulness of the capacitor to high slew-rate
transient loading. Unfortunately, ESL is not a specified
parameter. Work with your capacitor supplier and measure
the capacitor’s impedance with frequency to select a
suitable component. In most cases, multiple electrolytic
capacitors of small case size perform better than a single
large case capacitor.
Output Inductor Selection
The output inductor is selected to meet the output voltage
ripple requirements and minimize the converter’s response
time to the load transient. The inductor value determines the
converter’s ripple current and the ripple voltage is a function
of the ripple current. The ripple voltage and current are
approximated by Equation 7:
ΔI = V-----I--N-F----s------Vx----OL----U-----T- • V----V-O---I-U-N---T--
ΔVOUT = ΔI x ESR
(EQ. 7)
Increasing the value of inductance reduces the ripple current
and voltage. However, the large inductance values reduce
the converter’s response time to a load transient.
One of the parameters limiting the converter’s response to a
load transient is the time required to change the inductor
11 FN6605.0
December 11, 2007
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL8107.PDF ] | |
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