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PDF RT8179A Data sheet ( Hoja de datos )
| Número de pieza | RT8179A | |
| Descripción | Dual-Output PWM Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8179A (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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®
RT8179A
Dual-Output PWM Controller with 2 Integrated Drivers for
AMD SVI2 Mobile CPU Power Supply
General Description
The RT8179A is a dual-output PWM controller, and is
compliant with AMD SVI2 Voltage Regulator Specification
to support both CPU core (VDD) and Northbridge portion
of the CPU (VDDNB). The RT8179A features CCRCOT
(Constant Current Ripple Constant On-Time) with G-NAVP
(Green-Native AVP), which is Richtek's proprietary
topology. G-NAVP makes it an easy setting controller to
meet all AMD AVP (Adaptive Voltage Positioning) VDD/
VDDNB requirements. The droop is easily programmed
by setting the DC gain of the error amplifier. With proper
compensation, the load transient response can achieve
optimized AVP performance. The controller also uses the
interface to issue VOTF Complete and to send digitally
encoded voltage and current values for the VDD and
VDDNB domains. It can operate in diode emulation mode
and reach up to 90% efficiency in different modes according
to different loading conditions. The RT8179A provides
special purpose offset capabilities by pin setting. The
RT8179A also provides power good indication, over current
indication (OCP_L) and dual OCP mechanism for AMD
SVI2 CPU core and NB. It also features complete fault
protection functions including over voltage, under voltage
and negative voltage.
Features
1-Phase (VDD) + 1-Phase (VDDNB) PWM Controller
2 Embedded MOSFET Drivers
G-NAVPTM Topology
Support Dynamic Load-Line and Zero Load-Line
Diode Emulation Mode at Light Load Condition
SVI2 Interface to Comply with AMD Power
Management Protocol
Build-in ADC for VOUT and IOUT Reporting
Immediate OV, UV and NV Protections and UVLO
Programmable Dual OCP Mechanisms
DVID Turbo Boost Compensation
0.5% DAC Accuracy
Fast Transient Response
Power Good Indicator
Over Current Indicator
40-Lead WQFN Package
RoHS Compliant and Halogen Free
Applications
AMD SVI2 Mobile CPU
Laptop Computer
Simplified Application Circuit
To CPU
RT8179A
OCP_L
PHASE
SVC
MOSFET
SVD
SVT
PHASEA MOSFET
VVDD
VVDDNB
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8179A-07 January 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Function Block Diagram
RT8179A
IBIAS
FBA
COMPA
ISENA1P
ISENA1N
IMONA
RGND
FB
COMP
ISEN1P
ISEN1N
MUX
UVLO
ADC
From Control Logic
RGND
DAC
Soft-Start & Slew
Rate Control
ERROR
VSETA AMP
+
-
Offset
Cancellation
Current mirror
+x2 IBA1
-
SVI2 Interface
Configuration Registers
Control Logic
OFS/OFSA
Load Line
/Load Line A
RSET/RSETA
Loop Control
Protection Logic
OCP Threshold
+
+ - PWM
CMPA
QRA
TONA
TON
GENA
PWMA
1-PH
Driver
+
0.4
V064 -
Average
RSETA
IMONAI
From Control Logic
DAC
Soft-Start & Slew Rate
Control
ERROR
VSET AMP
+
-
Current mirror
+x1 IB1
-
OCP_TDCA,
OCP_SPIKEA
+ OCA To Protection Logic
-
VSENA OV/UV/NV
Offset
Cancellation
+
0.4
-
Average
IMONI
+
RSET
+
-
PWM
CMP
QR
TON
Driver
POR
PWM1
TON
GEN
1-PH
Driver
+
OCP_TDC,
OCP_SPIKE -
OC To Protection Logic
VSEN OV/UV/NV
GND
TONSETA
BOOTA
UGATEA
PHASEA
LGATEA
PVCC
TONSET
BOOT
UGATE
PHASE
LGATE
IMON V064
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8179A-07 January 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
RT8179A
Table 4. SET2 Pin Setting for VDD Controller QR Threshold,
DVID Compensation,NB 0LL and OCP Trigger Delay
SET2 Pin Voltage
QRTH
DVID
Before Current Injection VSET2 (mV) (for VDD) Compensation [0]
NB OLL
Setting
19 0
72 0
Disable
0
122 1
172 1
222 0
272 0
39mV
0
323 1
373 1
423 0
473 0
47mV
0
523 1
573 1
623 0
673 0
55mV
0
723 1
773 1
823 0
874 0
Disable
1
924 1
974 1
1024
0
1074
1124
39mV
1
0
1
1174
1
1224
0
1274
1324
47mV
1
0
1
1375
1
1425
0
1475
1525
55mV
1
0
1
1575
1
OCPTRGDELAY
(for VDD/VDDNB)
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
10ms
40ms
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8179A-07 January 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RT8179A.PDF ] | |
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