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PDF ISL8115 Data sheet ( Hoja de datos )
| Número de pieza | ISL8115 | |
| Descripción | High Voltage Synchronous Buck PWM Controller | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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High Voltage Synchronous Buck PWM Controller with
Integrated Gate Driver and Current Sharing Capability
ISL8115
The ISL8115 is a synchronous buck PWM controller with
current sharing capability. The current sharing function allows
multiple modules to be connected in parallel to achieve higher
output current and to reduce input and output ripple current,
resulting in fewer components and reduced output dissipation.
Utilizing voltage-mode control with input voltage feed-forward
compensation, the ISL8115 maintains a constant loop gain for
optimal transient response, especially for applications with a
wide input voltage range.
The ISL8115 protects against overcurrent conditions by
inhibiting the PWM operation while monitoring the current
with DCR of the output inductor, or a precision resistor. It also
has a pre-POR overvoltage protection option, which provides
some protection to the load if the upper MOSFET(s) is shorted.
The ISL8115 features remote ground sensing, programmable
input voltage UVLO, output under/overvoltage protection,
power-good indication, and fault Hand Shake capability.
Applications
• Power supply for datacom/telecom and POL
• Wide input voltage range buck regulators
• High current density power supplies RF power amplifier bias
compensation
Features
• Wide VIN range operation: 2.97V to 36V; up to 5.5V output
and 30A load current per phase
• Fast transient response
- Voltage-mode PWM leading-edge modulation with
non-linear control
- Input voltage feed-forward
• Integrated 5V high speed 4A MOSFET gate drivers
- Internal bootstrap diode
• Excellent output voltage regulation
- 0.6V ±1.0% internal reference (-40°C ~ 125°C)
- 0.6V ±0.7% internal reference (-40°C ~ 105°C)
- Differential voltage sensing
• Excellent current balancing and overcurrent protection
- Peak and average overcurrent protection
- Output current monitor on the ISET pin
• Oscillator programmable from 150kHz to 1.5MHz
- Frequency synchronization to external clock signal
• Diode emulation mode for light load efficiency improvement
• Power-good open drain output
• Pre-bias start-up function
• Output OVP, UVP; OTP
• Adjustable Soft-Start
CPLL
2.2nF
RPLL
5.11k
ROS1
2k
RFB3 3k
CFB2
33nF
RFB2
787
CFB3 RFB3
8.2nF 49.9Ω
CFB1
2.2nF
ROS
2k
3k
RFB1
C
0.22µF
1.27k
RISET
10k
CISET
1nF
CPLL_H
390pF
RCONF
11.8k
RSS
18.2k
RFSET
113k
REN_L
10k
25 GND
19 ISET
20 ISHARE
21 PLL_COMP
U1
22 CONF ISL8115FRTZ
23 CLKOUT
24 SS
12
LGATE
PVCC 11
PHASE 10
CPVCC
4.7µF
QL
4
RPCC 2*RJK0301
2.2Ω
UGATE 9
BOOT 8
VIN 7
CBOOT
0.22µF
CVIN 2.2µF
4
QH
2*RJK0305
REN_U
68.1k
CVCC
2.2µF
140k
RFF_L
4.12k
RVIN
2Ω
RFF_H
33.2k
R
2.8k
CVIN1
4*10µF
12
LOUT
320nH, 0.53mΩ, PA1513-321
FIGURE 1. TYPICAL APPLICATION CIRCUIT, 10V-15V INPUT, 1.5V/30A OUTPUT
2*6TPF330M9L;
4*100µF; 4*1µ
COUT
VOUT
1.5V/30A
10V-15V
VIN
September 23, 2013
FN8272.1
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 2013. 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
ISL8115
EN 2
1.22V
2.2µF
VCC
3
2.2Ω
4.7µF
PVCC
11
VIN
7
POWER-ON
RESET (POR)
INTERNAL SERIES
LINEAR REGULATOR
OV_H
OV_L
UV
OCP/UCP
CONTROLLER
SOFT-START
AND
FAULT LOGIC
OVER-TEMPERATURE
PROTECTION (OTP)
8 BOOT
9 UGATE
DIGITAL
SOFT-START
SS-CODE
VMON
NON-LINEAR
CONTROL
SAW
GATE
CONTROL
LOGIC
10kΩ
10 PHASE
PVCC
FB 17
RGND 16
COMP 18
Ish_corr2
VMON 15
PGOOD 4
MODE
SS-CODE
E/A
x1.10
x0.90
Vref
x1.20
x1.15
x0.50
Ish_corr1
PWM
DEM
12 LGATE
40kΩ
8 CYCLE-BY-CYCLE
PEAK CURRENT
LIMIT
OV_H
1.135µA
ISEN
CURRENT
MIRROR
OV_L
20µA
ISEN
ISEN
13 ISENA
14 ISENB
OCP
UV
SAW
H
I
C
C
U
P
OCP
UCP
1.4V
0.25V
5xISEN + 50µA 19 ISET
20 ISHARE
0.225V
DECODER
OSCILLATOR
GENERATOR
Ish_corr1
Ish_corr2
CURRENT
SHARE
BLOCK
CISET
24 22
5 6 21 1 23
EP
5 FN8272.1
September 23, 2013
5 Page 
ISL8115
Typical Performance Curves
Unless otherwise stated, all curves were tested with example circuit in Figure 1.
95
95
90
CCM_VIN = 12V
85
90
85
CCM_VIN = 5V
80 80
75
FS = 220kHz
70 0
5 10 15 20
OUTPUT CURRENT (A)
FIGURE 4. EFFICIENCY AT 12V INPUT, 1.5V OUTPUT
75
FS = 220kHz
70
0
5 10 15
OUTPUT CURRENT (A)
FIGURE 5. EFFICIENCY AT 5V INPUT, 1.5V OUTPUT
20
90
80 DEM_VIN = 12V
70
60
CCM_VIN = 12V
50
40
FS = 220kHz
30
0.5 1.5 2.5
OUTPUT CURRENT (A)
FIGURE 6. EFFICIENCY vs LOAD CURRENT AT 12V INPUT
3.5
100
DEM_VIN = 5V
90
80
CCM_VIN = 5V
70
60
50
40
FS = 220kHz
30
0.5 1.5 2.5 3.5
OUTPUT CURRENT (A)
FIGURE 7. EFFICIENCY vs LOAD CURRENT AT 5V INPUT
-0.010
-0.012
-0.014
-0.016
-0.018
-0.020
10 12 14
INPUT VOLTAGE (V)
FIGURE 8. LINE REGULATION, VOUT = 1.5V, IO = 20A
11
0.00000
-0.00010
-0.00020
-0.00030
-0.00040
-0.00050
-0.00060
-0.00070
-0.00080
16 0
5 10 15 20 25 30 35
OUTPUT CURRENT (A)
FIGURE 9. LOAD REGULATION, VIN = 12V, VOUT = 1.5V
FN8272.1
September 23, 2013
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ISL8115.PDF ] | |
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