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PDF ISL95839 Data sheet ( Hoja de datos )
| Número de pieza | ISL95839 | |
| Descripción | Dual 3+1 PWM Controller | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Dual 3+1 PWM Controller with Current Monitor for
IMVP-7/VR12™ CPUs
ISL95839
The ISL95839 Pulse Width Modulation (PWM) controller IC
provides a complete solution for IMVP-7/VR12™ compliant
microprocessor and graphic processor core power supplies. It
provides the control and protection for two Voltage Regulators
(VRs). The first VR, typical for Vcore, incorporates 2 integrated
drivers and can operate in 3-, 2- or 1-phase configurations. The
second VR, typical for Graphics, incorporates 1 integrated
driver. The two VRs share a serial control bus to communicate
with the CPU and achieve lower cost and smaller board area
compared with the two-chip approach.
Both VRs utilize Intersil’s Robust Ripple Regulator R3
Technology™. The R3 modulator has numerous advantages
compared to traditional modulators, including faster transient
response, variable switching frequency during load transients,
and improved light load efficiency due to its ability to
automatically change switching frequency.
The ISL95839 has several other key features. Both outputs
support either DCR current sensing with a single NTC
thermistor for DCR temperature compensation, or more
precise resistor current sensing if desired. Both outputs come
with remote voltage sense, programmable VBOOT voltage,
IMAX, and switching frequency, adjustable overcurrent
protection and separate Power-Good signals.
Features
• Serial data bus
• Dual outputs:
- Configurable 3-, 2- or 1-phase for the 1st output using two
integrated gate drivers
- 2nd output using an integrated gate driver
• R3™ Modulator
- Excellent transient response
- High light load efficiency
• 0.5% system accuracy over-temperature
• Supports multiple current sensing methods
- Lossless inductor DCR current sensing
- Precision resistor current sensing
• Differential remote voltage sensing
• Programmable VBOOT voltage at start-up
• Resistor programmable IMAX, switching frequency for both
outputs
• Output current monitor (IMON and IMONG)
• Adaptive body diode conduction time reduction
Applications
• IMVP-7/VR12 compliant computers
Vin
VR2
Vin
ISL95839
ISL6208B
DRIVER
Vin
VR1
Vin
0.91
0.90
0.89
0.88
0.87
0.86
0.85
0.84
0.83
0.82
0.81
0.80
0
VIN = 19V
VIN = 12V
VIN = 8V
6 12 18 24 30 36 42 48 54 60 66
IOUT (A)
FIGURE 1. SIMPLIFIED APPLICATION CIRCUIT
FIGURE 2. LOAD LINE REGULATION
May 9, 2013
FN8315.0
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) and R3 Technology™ are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Free Datasheet http://www.datasheet4u.com/
1 page  
Block Diagram
ISL95839
COMPG
RTNG
FBG
ISUMPG
ISUMNG
IMONG
NTCG
NTC
VR_HOT#
VR_ON
SDA
ALERT#
SCLK
COMP
RTN
FB
FB2
ISUMP
ISUMN
ISEN3
ISEN2
ISEN1
+
+Σ
+
E/A
_
IDROOPG
+
CURRENT
_ SENSE
VR2
MODULATOR
DRIVER
OC FAULT
OV FAULT
DRIVER
TEMP
MONITOR
T_MONITOR
IMAX
VBOOT
TMAX
SET (A/D)
PROG
DIGITAL
INTERFACE
A/D
D/A
MODE
IDROOPG
IDROOP
DAC2
DAC1
MODE2
MODE1
VREADY
DRIVER
FB2
CIRCUIT
+
_
+
+Σ
+
E/A
_
IDROOP
CURRENT
SENSE
CURRENT
BALANCING
IMON
5
VR1
MODULATOR
DRIVER
DRIVER
GND
OC FAULT
IBAL FAULT
OV FAULT
DRIVER
BOOT1G
UGATE1G
PHASE1G
LGATE1G
PGOODG
VDD
VCCP
PWM3
BOOT2
UGATE2
PHASE2
LGATE2
BOOT1
UGATE1
PHASE1
LGATE1
PGOOD
FN8315.0
May 9, 2013
Free Datasheet http://www.datasheet4u.com/
5 Page 
ISL95839
VW
Vcrm
COMP
Master
Clock
Clock1
PWM1
Clock2
PWM2
HYSTERETIC
W IN D O W
rises as the COMP voltage rises, making the PWM pulses wider.
During load release response, the COMP voltage falls. It takes
the master clock circuit longer to generate the next master clock
signal so the PWM pulse is held off until needed. The VW voltage
falls as the COMP voltage falls, reducing the current PWM pulse
width. This kind of behavior gives the controller excellent
response speed.
The fact that all the phases share the same VW window voltage
also ensures excellent dynamic current balance among phases.
Diode Emulation and Period Stretching
Clock3
PWM3
VW
Phase
UGATE
Vcrs2 Vcrs3 Vcrs1
FIGURE 5. R3™ MODULATOR OPERATION PRINCIPLES IN
STEADY STATE
VW
Vcrm
Master
Clock
Clock1
PWM1
Clock2
PWM2
Clock3
PWM3
COMP
VW
Vcrs1
Vcrs3
Vcrs2
FIGURE 6. R3™ MODULATOR OPERATION PRINCIPLES IN LOAD
INSERTION RESPONSE
Figure 6 shows the operation principles during load insertion
response. The COMP voltage rises during load insertion,
generating the master clock signal more quickly, so the PWM
pulses turn on earlier, increasing the effective switching
frequency, which allows for higher control loop bandwidth than
conventional fixed frequency PWM controllers. The VW voltage
LGATE
IL
FIGURE 7. DIODE EMULATION
ISL95839 can operate in diode emulation (DE) mode to improve
light load efficiency. In DE mode, the low-side MOSFET conducts
when the current is flowing from source to drain and doesn’t allow
reverse current, emulating a diode. As Figure 7 shows, when
LGATE is on, the low-side MOSFET carries current, creating
negative voltage on the phase node due to the voltage drop across
the ON-resistance. The controller monitors the current through
monitoring the phase node voltage. It turns off LGATE when the
phase node voltage reaches zero to prevent the inductor current
from reversing the direction and creating unnecessary power loss.
If the load current is light enough, as Figure 7 shows, the inductor
current will reach and stay at zero before the next phase node
pulse and the regulator is in discontinuous conduction mode
(DCM). If the load current is heavy enough, the inductor current
will never reach 0A, and the regulator is in CCM although the
controller is in DE mode.
Figure 8 shows the operation principle in diode emulation mode at
light load. The load gets incrementally lighter in the three cases
from top to bottom. The PWM on-time is determined by the VW
window size, therefore is the same, making the inductor current
triangle the same in the three cases. The controller clamps the
master ripple capacitor voltage Vcrm and the slave ripple capacitor
voltage Vcrs in DE mode to make it mimic the inductor current. It
takes the Vcrm longer to hit COMP, naturally stretching the
switching period. The inductor current triangles move further apart
from each other such that the inductor current average value is
equal to the load current. The reduced switching frequency helps
increase light load efficiency.
11
FN8315.0
May 9, 2013
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ISL95839.PDF ] | |
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