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PDF RT8878A Data sheet ( Hoja de datos )
| Número de pieza | RT8878A | |
| Descripción | Dual-Output PWM Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8878A (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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®
RT8878A
Dual-Output PWM Controller with 2 Integrated Drivers for
AMD SVI2 CPU Power Supply
General Description
The RT8878A is a 4 + 2 phases 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 RT8878A 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 (Active 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 single phase and diode
emulation mode and reach up to 90% efficiency in different
modes according to different loading conditions. The
RT8878A provides special purpose offset capabilities by
pin setting. The RT8878A 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
4/3/2/1-Phase (VDD) + 2/1/0-Phase (VDDNB) PWM
Controller
2 Embedded MOSFET Drivers at the VDD Controller
G-NAVPTM Topology
Support Dynamic Load-Line and Zero Load-Line
Diode Emulation Mode at Light Load Condition
SVI2 Interface to Comply AMD Power Management
Protocol
Build-in ADC for VOUT and IOUT Reporting
Immediate OV, UV and NV Protections and UVLO
Programmable Dual OCP Mechanism
0.5% DAC Accuracy
Fast Transient Response
Power Good Indicator
Over Current Indicator
52-Lead WQFN Package
RoHS Compliant and Halogen Free
Applications
AMD SVI2 CPU
Desktop Computer
Simplified Application Circuit
To CPU
RT8878A
OCP_L PHASE1
SVC
PHASE2
PWM3
SVD
PWM4
PWMA1
SVT PWMA2
MOSFET
MOSFET
RT9624A MOSFET
RT9624A MOSFET
RT9624A MOSFET
RT9624A MOSFET
VVDD
VVDDNB
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8878A-01 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Function Block Diagram
RT8878A
IBIAS
FBA
COMPA
ISENA1P
ISENA1N
ISENA2P
ISENA2N
IMONA
RGND
FB
COMP
ISEN1P
ISEN1N
ISEN2P
ISEN2N
ISEN3P
ISEN3N
ISEN4P
ISEN4N
MUX
POR UVLO
ADC
From Control Logic
SVI2 Interface
Configuration Registers
Control Logic
OFS/OFSA
Load Line
/Load Line A
RSET/RSETA
Loop Control
Protection Logic
RGND
DAC
Soft-Start & Slew
Rate Control
VSETA
ERROR
AMP
+
-
Offset
Cancellation
OCP Threshold
PWM
CMPA
+
+-
QRA
TONA
TON
GENA
Current mirror
+x2
-
IBA1
V064
+0.4
-
Current mirror
RSETA
+x2
-
IBA2
Average
IMONAI
Current Balance
IBA1 IBA2
From Control Logic
DAC
Soft-Start & Slew Rate
Control
OCP_TDCA,
OCP_SPIKEA
ERROR
VSET AMP
+
-
Offset
Cancellation
+ OCA To Protection Logic
-
VSENA OV/UV/NV
PWM
PWM1
CMP
+
TON PWM2
2-PH
Driver
+ - QR GEN
Current mirror
+x1 IB1
-
Current mirror
TON
+0.4
-
RSET
+x1 IB2
-
Current mirror
+x1 IB3
-
Average
IMONI
Current Balance
IB1 IB2 IB3 IB4
Current mirror
+x1 IB4
-
OCP_TDC, +
OCP_SPIKE -
OC To Protection Logic
VSEN OV/UV/NV
GND
TONSETA
PWMA1
PWMA2
TONSET
BOOTx
UGATEx
PHASEx
LGATEx
PWM3
PWM4
IMON V064
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8878A-01 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
SET2 Pin Voltage
Before Current Injection VSET2 (mV)
19
72
122
172
222
272
323
373
423
473
523
573
623
673
723
773
823
874
924
974
1024
1074
1124
1174
1224
1274
1324
1375
1425
1475
1525
1575
Table 4. SET2 Pin Setting
QRTH
(for VDD)
OCPTRGDELAY
[1:0]
00
Disable
01
10
11
00
35mV
01
10
11
00
39mV
01
10
11
00
43mV
01
10
11
00
47mV
01
10
11
00
51mV
01
10
11
00
55mV
01
10
11
00
60mV
01
10
11
RT8878A
OCPTRGDEL AY
(for VDD/VDDNB)
10ms
20ms
30ms
40ms
10ms
20ms
30ms
40ms
10ms
20ms
30ms
40ms
10ms
20ms
30ms
40ms
10ms
20ms
30ms
40ms
10ms
20ms
30ms
40ms
10ms
20ms
30ms
40ms
10ms
20ms
30ms
40ms
Copyright ©2014 Richtek Technology Corporation. All rights reserved.
DS8878A-01 January 2014
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RT8878A.PDF ] | |
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