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PDF ISL78227 Data sheet ( Hoja de datos )
| Número de pieza | ISL78227 | |
| Descripción | 2-Phase Boost Controller | |
| Fabricantes | Intersil Corporation | |
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DATASHEET
2-Phase Boost Controller with Integrated Drivers
ISL78227
The ISL78227 is an automotive grade (AEC-Q100 Grade 1),
2-phase 55V synchronous boost controller intended to simplify
the design of high power boost applications. It integrates
strong half-bridge drivers, an analog/digital tracking input and
comprehensive protection functions.
The ISL78227 enables a simple, modular design for systems
requiring power and thermal scalability. It offers peak-current
mode control for fast line response and simple compensation.
Its synchronous 2-phase architecture enables it to support
higher current while reducing the size of input and output
capacitors. The integrated drivers feature programmable
adaptive dead time control offering flexibility in power stage
design. ISL78227 offers a 90°output clock and supports 1-,
2- and 4-phases.
The ISL78227 offers a highly robust solution for the most
demanding environments. Its unique soft-start control
prevents large negative current even in extreme cases, such as
a restart under high output prebias on high volume
capacitances. It also offers two levels of cycle-by-cycle
overcurrent protection, average current limiting, input OVP,
output UVP/OVP and internal OTP. In the event of a fault, the
fault protection response can be selected to be latch-off or
hiccup recovery.
Also integrated are several functions that ease system design.
A unique tracking input is available that can control the output
voltage, allowing it to track either a digital duty cycle (PWM)
signal or an analog reference. The ISL78227 provides input
average current limiting so the system can deliver transient
bursts of high load current while limiting the average current to
avoid overheating.
Features
• Input/output voltage range: 5V to 55V, withstands 60V
transients
• Supports synchronous or standard boost topology
• Peak current mode control with adjustable slope
compensation
• Secondary average current control loop
• Integrated 5V 2A sourcing/3A sinking N-channel MOSFET
drivers
• Switching frequency: 50kHz to 1.1MHz per phase
• External synchronization
• Programmable minimum duty cycle
• Programmable adaptive dead time control
• Optional diode emulation and phase dropping
• PWM and analog track function
• Forced PWM operation with negative current limiting and
protection
• Comprehensive fault protections
• Selectable hiccup or latch-off fault response
• AEC-Q100 qualified, Grade 1: -40°C to +125°C
• 5mmx5mm 32 Ld WFQFN (Wettable Flank QFN) package
Applications
• Automotive power system (e.g., 12V to 24V, 12V to 48V, etc.)
- Trunk audio amplifier
- Start-stop system
- Automotive boost applications
• Industrial and telecommunication power supplies
PVCC
VIN
EN_IC
POWER-GOOD
CLOCK_OUT
PVCC
PGND
VIN
BOOT1
UG1
PH1
LG1
EN
PGOOD
ISEN1N
ISEN1P
ISL78227
BOOT2
TRACK
CLKOUT
SS
COMP
UG2
PH2
LG2
ISEN2N
ISEN2P
FB
PVCC
RSEN1
VOUT
VIN
RSEN2
FIGURE 1. SIMPLIFIED APPLICATION SCHEMATIC, 2-PHASE
SYNCHRONOUS BOOST
100
95
90 VO = 18V
85
80 VO = 24V
75
70
VO = 36V
65
60
55
50
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
LOAD CURRENT (A)
NOTE: (See Typical Application in Figure 4 on page 8.)
FIGURE 2. EFFICIENCY CURVES, VIN = 12V, TA = +25°C
February 24, 2016
FN8808.2
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, 2016. 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  
ISL78227
Functional Pin Description (Continued)
PIN NAME
BOOT2
UG2
PH2
LG2
PGND
PVCC
LG1
PH1
UG1
BOOT1
VIN
ISEN1N
ISEN1P
ISEN2N
ISEN2P
ATRK/DTRK
RDT
SGND
PIN #
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
-
DESCRIPTION
This pin provides bias voltage to the Phase 2 high-side MOSFET driver. A bootstrap circuit is used to create a voltage suitable
to drive the external N-channel MOSFET. A 0.47µF ceramic capacitor in series with a 1.5Ω resistor are recommended between
the BOOT2 and PH2 pins. In the typical configuration, PVCC is providing the bias to BOOT2 through a fast switching diode.
In applications where a high-side driver is not needed (standard boost application for example), BOOT2 is recommended
to be connected to ground. The ISL78227 IC can detect BOOT2 being grounded during start-up and both the Phase 1 and
Phase 2 high-side drivers will be disabled. In addition, PH1 and PH2 should also be tied to ground.
Phase 2 high-side gate driver output. This output can be disabled by tying either BOOT1 and PH1 to ground or BOOT2 and
PH2 to ground.
Connect this pin to the source of the Phase 2 high-side MOSFETs and the drain of the low-side MOSFETs. This pin
represents the return path for the Phase 2 high-side gate drive.
Phase 2 low-side gate driver output. It should be connected to the Phase 2 low-side MOSFETs’ gates.
Provides the return path for the low-side MOSFET drivers. This pin carries a noisy driving current and traces connecting
from this pin to the low-side MOSFET source and PVCC decoupling capacitor ground pad should be as short as possible.
All the sensitive analog signal traces should not share common traces with this driver return path. Connect this pin to
the ground copper plane (wiring away from the IC instead of connecting through the IC bottom PAD) through several vias
as close as possible to the IC.
Output of the internal linear regulator that provides bias for the low-side driver, high-side driver (PVCC connected to BOOTx
through diodes) and VCC bias (PVCC and VCC are typically connected through a small resistor like 10Ω or smaller, which helps
to filter out the noises from PVCC to VCC). The PVCC operating range is 4.75V to 5.5V. A minimum 10µF decoupling ceramic
capacitor should be used between PVCC and PGND. Refer to “Internal 5.2V LDO” on page 36 for more details.
Phase 1 low-side gate driver output. It should be connected to the Phase 1 low-side MOSFETs’ gates.
Connect this pin to the source of the Phase 1 high-side MOSFETs and the drain of the low-side MOSFETs. This pin
represents the return path for the Phase 1 high-side gate drive.
Phase 1 high-side MOSFET gate drive output. This output can be disabled by tying either BOOT1 and PH1 to ground or
BOOT2 and PH2 to ground.
This pin provides bias voltage to the Phase 1 high-side MOSFET driver. A bootstrap circuit is used to create a voltage suitable
to drive the external N-channel MOSFET. A 0.47µF ceramic capacitor in series with a 1.5Ω resistor are recommended between
BOOT1 and PH1 pins. In typical configuration, PVCC is providing the bias to BOOT1 through a fast switching diode.
In applications where a high-side driver is not needed (for example, standard boost application), the BOOT1 is
recommended to be connected to ground. The ISL78227 IC can detect BOOT1 being grounded during start-up and both
the Phase 1 and Phase 2 high-side drivers will be disabled. In addition, PH1 and PH2 should also be tied to ground.
Connect supply rail to this pin. Typically, connect boost input voltage to this pin. This pin is connected to the input of the internal
linear regulator, generating the power necessary to operate the chip. The DC voltage applied to VIN should not exceed 55V
during normal operation. VIN can withstand transients up to 60V, but in this case, the device's overvoltage protection will stop
it from switching to protect itself. Refer to “Input Overvoltage Fault Protection” on page 34 for more details.
The ISEN1N pin is the negative potential input to the Phase 1 current sense amplifier. This amplifier continuously senses
the Phase 1 inductor current through a power current sense resistor in series with the inductor. The sensed current signal
is used for current mode control, peak current limiting, average current limiting and diode emulation.
The ISEN1P pin is the positive potential input to the Phase 1 current sense amplifier.
The ISEN2N pin is the negative potential input to the Phase 2 current sense amplifier. This amplifier continuously senses
the Phase 2 inductor current through a power current sense resistor in series with the inductor. The sensed current signal
is used for current mode control, peak current limiting, average current limiting and diode emulation.
The ISEN2P pin is the positive phase input to the Phase 2 current sense amplifier.
The logic input pin to select the input signal format options for the TRACK pin. Pull this pin HIGH for the TRACK pin to
accept analog input signals. Pull this pin LOW for the TRACK pin to accept digital input signals. Refer to “Digital/Analog
Track Function” on page 25 for more details.
A resistor connected from this pin to ground programs the dead times between UGx OFF to LGx ON and LGx OFF to UGx
ON to prevent shoot-through. Please refer to “Driver Configuration” on page 24 for the selection of RDT.
Signal ground bottom pad for the internal sensitive analog circuits to be referred to, also serves as thermal pad. Connect
this pad to large ground plane. Put multiple vias (as many as possible) in this pad connecting to the ground copper plane to
help reduce the IC’s JA. In layout power flow planning, avoid having the noisy high frequency pulse current flow through
the SGND area.
Submit Document Feedback
5
FN8808.2
February 24, 2016
5 Page 
ISL78227
Electrical Specifications Refer to Figure 3 on page 7 and Typical Application Schematics (page 8). Operating conditions unless
otherwise noted: VIN = 12V, VPVCC = 5.2V and VVCC = 5.2V, TA = -40°C to +125°C (Note 7). Typicals are at TA = +25°C. Boldface limits apply across
the operating temperature range, -40°C to +125°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN MAX
(Note 6) TYP (Note 6) UNIT
Input Minimum Pulse Width - Fall-to-Rise
20 ns
Delay Time from Input Pulse Rising to LG1
Rising Edge Minus Dead Time tDT1
Input Impedance
CLG = OPEN, RDT = 50kΩ
Input impedance before synchronization
mode
35 ns
1 kΩ
Input impedance after synchronization mode
200
MΩ
CLKOUT
CLKOUTH
ICLKOUT = 500µA
VCC - VCC - 0.1
0.5
V
CLKOUTL
Output Pulse Width
ICLKOUT = -500µA
CCLKOUT = 100pF, tSW is each phase’s
switching period
0.1
1/12 * tSW
0.4
V
Phase Shift from LG1 Rising Edge to CLKOUT
Pulse Rising Edge
CLG1 = OPEN, CCLKOUT = OPEN,
fSW = 300kHz, tDT1 = 60ns (Please refer to
Figure 56 on page 28 for the timing
diagram)
87
°
SOFT-START
Soft-Start Current
Minimum Soft-Start Prebias Voltage
ISS
4.5 5.0 5.5 µA
0V
Maximum Soft-Start Prebias Voltage
1.6 V
Soft-Start Prebias Voltage Accuracy
VFB = 500mV
Soft-Start Clamp Voltage
VSSCLAMP
HICCUP RETRY DELAY (Please refer to “Selectable Hiccup or Latch-Off Fault Response” on page 33 for details)
-25
3.25
0
3.47
25
3.70
mV
V
Hiccup Retry Delay
If Hiccup fault response selected
500 ms
REFERENCE VOLTAGE FOR OUTPUT VOLTAGE REGULATION
System Reference Accuracy
Measured at the FB pin
1.576 1.600 1.620 V
FB Pin Input Bias Current
VFB = 1.6V, TRACK = Open
ERROR AMPLIFIER FOR OUTPUT VOLTAGE REGULATION (Gm1)
-0.05
0.01
0.05 µA
Transconductance Gain
2 mA/V
Output Impedance
7.5 MΩ
Unity Gain Bandwidth
Slew Rate
Output Current Capability
CCOMP = 100pF from COMP pin to GND
CCOMP = 100pF from COMP pin to GND
3.3
±3
±300
MHz
V/µs
µA
Maximum Output Voltage
3.5 3.7
V
Minimum Output Voltage
0.1 0.3 V
PWM CORE
SLOPE Pin Voltage
480 500 520 mV
SLOPE Accuracy
Duty Cycle Matching
RSLOPE = 20k (0.1%)
-20 0 20 %
RSLOPE = 40.2k (0.1%)
-20 3 20 %
VRSENx = 30mV, RSETx = 665Ω (0.1%),
RSLOPE = 27k, fSW = 150kHz,
VCOMP = 2.52V, Measure
(Ton_lg2 - Ton_lg1)/(Ton_lg2 + Ton_lg1) *2
3%
Submit Document Feedback 11
FN8808.2
February 24, 2016
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ISL78227.PDF ] | |
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