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PDF RT8877C Data sheet ( Hoja de datos )
| Número de pieza | RT8877C | |
| Descripción | Dual-Output PWM Controller | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8877C (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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®
RT8877C
Dual-Output PWM Controller for AMD SVI2 CPU Power
Supply
General Description
The RT8877C is a 4 + 2 phases PWM controller. Moreover,
it is compliant with AMD SVI2 Voltage Regulator
Specification to support both CPU core (VDD) and
Northbridge portion of the CPU (VDDNB). The RT8877C
features CCRCOT (Constant Current Ripple Constant On-
Time) with G-NAVP (Green-Native AVP), which is a
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 RT8877C provides special purpose offset
capabilities by pin setting. The RT8877C 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
z 4/3/2/1-Phase (VDD) + 2/1/0-Phase (VDDNB) PWM
Controller
z G-NAVPTM Topology
z Support Dynamic Load Line and Zero Load Line
z Diode Emulation Mode at Light Load Condition
z SVI2 Interface to Comply AMD Power Management
Protocol
z Build-in ADC for VOUT and IOUT Reporting
z Immediate OV, UV and NV Protections and UVLO
z Programmable Dual OCP Mechanism
z 0.5% DAC Accuracy
z Fast Transient Response
z Power Good Indicator
z Over Current Indicator
z 52-Lead WQFN Package
z RoHS Compliant and Halogen Free
Applications
z AMD SVI2 CPU
z Desktop Computer
Simplified Application Circuit
To CPU
RT8877C
OCP_L
PWM1
SVC
PWM2
PWM3
SVD
PWM4
PWMA1
SVT PWMA2
RT9624A
RT9624A
RT9624A
RT9624A
RT9624A
RT9624A
MOSFET
MOSFET
MOSFET
MOSFET
MOSFET
MOSFET
VVDD
VVDDNB
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8877C-00 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
Function Block Diagram
RT8877C
IBIAS
FBA
COMPA
ISENA1P
ISENA1N
ISENA2P
ISENA2N
IMONA
RGND
FB
COMP
ISEN1P
ISEN1N
ISEN2P
ISEN2N
ISEN3P
ISEN3N
ISEN4P
ISEN4N
MUX
UVLO
From Control Logic
RGND DAC
Soft-Start & Slew
Rate Control
ERROR
VSETA AMP
+
-
ADC
Offset
Cancellation
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
Current mirror
+x2
-
IBA1
+
0.4
V064 -
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
CMP
+
+-
TON
GEN
QR
Current mirror
+x1 IB1
-
Current mirror
+x1 IB2
-
Current mirror
+x1 IB3
-
+
0.4
-
Average
IMONI
RSET
TON
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
PWM1
PWM2
PWM3
PWM4
IMON V064
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8877C-00 November 2012
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
RT8877C
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 ©2012 Richtek Technology Corporation. All rights reserved.
DS8877C-00 November 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet RT8877C.PDF ] | |
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