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PDF ISL8117 Data sheet ( Hoja de datos )
| Número de pieza | ISL8117 | |
| Descripción | Synchronous Step-down PWM Controller | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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DATASHEET
Synchronous Step-down PWM Controller
ISL8117
The ISL8117 is a synchronous buck controller to generate POL
voltage rails and bias voltage rails for a wide variety of
applications in industrial and general purpose segments. Its
wide input and output voltage ranges make it suitable for
telecommunication and after-market automotive applications.
The ISL8117 uses the valley current modulation technique to
bring hassle-free power supply design with minimal number of
components and complete protection from unwanted events.
The ISL8117 offers programmable soft-start and enable
functions along with a power-good indicator for ease of supply
rail sequencing and other housekeeping requirements. In ideal
situations, a complete power supply circuit can be designed
with 10 external components and provide OV/OC/OT
protections in a space conscious 16 Ld 4mmx4mm QFN or
easy to assemble 6.4mmx5mm 16 Ld HTSSOP package. Both
packages use an EPAD to improve thermal dissipation and
noise immunity. Low pin count, less number of external
components and default internal values, makes the ISL8117
an ideal solution for quick to market simple power supply
designs. The ISL8117 utilizes internal loop compensation and
single resistor settings for other functions such as operating
frequency and overcurrent protection. Its current mode control
with VIN feed-forward enables it to cover various applications
even with fixed internal compensations. The unique
DEM/Skipping mode at light-load dramatically lowers standby
power consumption with consistent output ripple over different
load levels.
Related Literature
• UG020, “ISL8117EVAL2Z Evaluation Board User Guide”
• UG021, “ISL8117DEMO2Z Demonstration Board User Guide”
• UG030, “ISL8117EVAL1Z Evaluation Board User Guide”
• UG031, “ISL8117DEMO1Z Demonstration Board User Guide”
Features
• Wide input voltage range: 4.5V to 60V
• Wide output voltage range: 0.6V to 54V
• Light-load efficiency enhancement
- Low ripple diode emulation mode with pulse skipping
• Programmable soft-start
• Supports prebiased output with SR soft-start
• Programmable frequency: 100kHz to 2MHz
• External sync
• PGOOD indicator
• Forced PWM
• Adaptive shoot-through protection
• No external current sense resistor
- Use lower MOSFET rDS(ON)
• Complete protection
- Overcurrent, overvoltage, over-temperature, undervoltage
• Pb-free (RoHS compliant)
Applications
• PLC and factory automation
• Amusement machines
• Security surveillance
• Server and data centers
• Switcher and routers
• Telecom and datacom
• LED panels
1 EXTBIAS
VIN 16
2 EN
BOOT 15
3 CLKOUT
UGATE 14
4
MOD
SYNC
SGND
5 PGOOD
PHASE 13
ISEN 12
6 RT
7 SS/TRK
8 FB
VCC5V 11
LGATE
OCS
10
PGND 9
VIN
VOUT
FIGURE 1. TYPICAL APPLICATION
100
98
96
94
92
90
88
86
840
VIN = 18V
VIN = 24V
VIN = 60V
VIN = 36V VIN = 48V
2 4 6 8 10 12 14 16
OUTPUT CURRENT (A)
FIGURE 2. EFFICIENCY
June 4, 2015
FN8666.3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2015. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
Block Diagram
BOOT
UGATE
PHASE
5VCC
LGATE/OCS
PGND LGATE/OCS
ISL8117
5VCC
ADAPTIVE
DEAD TIME
V/I SAMPLE TIMING
PGOOD EN
VIN VCC5V
SS/TRK
POR
ENABLE
BIAS SUPPLIES
REFERENCE
FAULT LATCH
SEE Note 6
EXTBIAS
SW THRES.
PGND
FB
_+
0.6V
REF
_
+
SS/TRK
ISEN
CURRENT
SAMPLE
LGATE/OCS
OC OV/UV
PWM
FB
2µA
SS/TRK
CURRENT
SAMPLE
5VCC
VIN
DUTY CYCLE
RAMP GENERATOR
CLOCK
CLKOUT
MOD/SYNC
_+
1.75V
REFERENCE
OC
SAME STATE FOR
2 CLOCK CYCLES
REQUIRED TO LATCH
OVERCURRENT FAULT
FIGURE 3. BLOCK DIAGRAM
RT
SGND
Submit Document Feedback
5
FN8666.3
June 4, 2015
5 Page 
ISL8117
Typical Performance Curves Oscilloscope plots are taken using the ISL8117EVAL2Z evaluation board, VIN = 18 to 60V,
VOUT = 12V, IOUT = 20A unless otherwise noted. (Continued)
605 120
604
603 100
602 80
601
600 60
599
598 40
597
20
596
595
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
FIGURE 12. REFERENCE VOLTAGE vs TEMPERATURE
0
0 0.5 1.0 1.5 2.0 2.5 3.0
SOFT-START PIN VOLTAGE (V)
FIGURE 13. NORMALIZED OUTPUT VOLTAGE vs VOLTAGE ON
SOFT-START PIN
3.5
100
90
80
70 VIN = 24V
60
50
40 VIN = 18V
30
VIN = 60V
VIN = 48V
20 VIN = 36V
10
0
0.01
0.1 1
IOUT (A)
FIGURE 14. CCM MODE EFFICIENCY
10
20
100
90
80
70
60
50
40
30
20
10
0
0.01
VIN = 24V
VIN = 18V
VIN = 60V
VIN = 48V
VIN = 36V
0.1 1
IOUT (A)
FIGURE 15. DEM MODE EFFICIENCY
10 20
1.0
0.8
0.6
0.4
0.2 VIN = 24V
0.0
-0.2 VIN = 18V
-0.4 VIN = 36V
-0.6
VIN = 48V
VIN = 60V
-0.8
-1.0
0 2 4 6 8 10 12 14 16 18 20
OUTPUT CURRENT (A)
FIGURE 16. CCM MODE LOAD REGULATION
Submit Document Feedback 11
1.0
0.8
0.6 IO = 10A
IO = 20A
0.4
0.2
0.0
-0.2
-0.4 IO = 0A
-0.6
-0.8
-1.0
18
24 30 36 42 48 54
VIN (V)
FIGURE 17. CCM MODE LINE REGULATION
60
FN8666.3
June 4, 2015
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet ISL8117.PDF ] | |
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