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PDF L6919E Data sheet ( Hoja de datos )
| Número de pieza | L6919E | |
| Descripción | 5-BIT PROGRAMMABLE DUAL-PHASE CONTROLLER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de L6919E (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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L6919E
5 BIT PROGRAMMABLE DUAL-PHASE CONTROLLER
WITH DYNAMIC VID MANAGEMENT
s 2 PHASE OPERATION WITH
SYNCRHONOUS RECTIFIER CONTROL
s ULTRA FAST LOAD TRANSIENT RESPONSE
s INTEGRATED HIGH CURRENT GATE
DRIVERS: UP TO 2A GATE CURRENT
s TTL-COMPATIBLE 5 BIT PROGRAMMABLE
)OUTPUT FROM 0.800V TO 1.550V WITH
t(s25mV STEPS
cs DYNAMIC VID MANAGEMENT
us 0.6% OUTPUT VOLTAGE ACCURACY
ds 10% ACTIVE CURRENT SHARING ACCURACY
ro )s DIGITAL 2048 STEP SOFT-START
P t(ss OVERVOLTAGE PROTECTION
s OVERCURRENT PROTECTION REALIZED
te cUSING THE LOWER MOSFET'S RdsON OR A
le uSENSE RESISTOR
so rods OSCILLATOR EXTERNALLY ADJUSTABLE
AND INTERNALLY FIXED AT 200kHz
b Ps POWER GOOD OUTPUT AND INHIBIT
- O teFUNCTION
s REMOTE SENSE BUFFER
) les PACKAGE: SO-28
ct(s bsoAPPLICATIONS
u Os POWER SUPPLY FOR SERVERS AND
d -WORKSTATIONS
ro )s POWER SUPPLY FOR HIGH CURRENT
P t(sMICROPROCESSORS
te cs DISTRIBUTED POWER SUPPLY
SO-28
ORDERING NUMBERS:L6919E
L6919ETR
DESCRIPTION
The device is a power supply controller specifically
designed to provide a high performance DC/DC
conversion for high current microprocessors. The
device implements a dual-phase step-down con-
troller with a 180° phase-shift between each
phase. A precise 5-bit digital to analog converter
(DAC) allows adjusting the output voltage from
0.800V to 1.550V with 25mV binary steps manag-
ing On-The-Fly VID code changes.
The high precision internal reference assures the
selected output voltage to be within ±0.6%. The
high peak current gate drive affords to have fast
switching to the external power mos providing low
switching losses.
The device assures a fast protection against load
over current and load over/under voltage. An inter-
nal crowbar is provided turning on the low side
mosfet if an over-voltage is detected. In case of
over-current, the system works in Constant Cur-
rent mode.
le duBLOCK DIAGRAM
Obso te ProPGOOD
OSC / INH
SGN D
PW M1
VCCD R
HS
BOO T 1
UGA T E1
PHAS E1
sole DIGITAL
Ob SOFT-START
VCC
VCC DR
TO TAL
C UR REN T
CH1
OCP
LS
CUR REN T
REA DIN G
L GAT E1
ISE N1
PGN DS1
VID 4
PGN D
VID 3
VID 2
VID 1
VID 0
DAC
CH2 OCP
CH1 OCP
CUR REN T
REA DIN G
PGN DS2
ISE N2
CH2
LS L GAT E2
OCP
32k
FB G
FB R
3 2k
3 2k
R EMO TE
32k
BUFFER
I FB
ERR OR
A MPL IF IER
PW M2
Vcc
HS
PHAS E2
U GA T E2
BOO T 2
VS EN
FB
COM P
V cc
September 2003
1/33
1 page  
L6919E
Table 1. Voltage Identification (VID) Codes
VID4
VID3
VID2
VID1
VID0
Output
Voltage (V)
VID4
VID3
VID2
VID1
VID0
Output
Voltage (V)
00000
1.575
10000
1.175
00001
1.550
10001
1.150
00010
1.525
10010
1.125
00011
1.500
10011
1.100
00100
1.475
10100
1.075
00101
1.450
10101
1.050
00110
1.425
10110
1.025
00111
1.400
10111
01000
1.375
11000
t(s)0 1 0 0 1
1.350
11001
01010
1.325
11010
uc0 1 0 1 1
1.300
11011
d0 1 1 0 0
1.275
11100
Pro t(s)0 1 1 0 1
1.250
11101
01110
1.225
11110
te c0 1 1 1 1
1.200
11111
le duThe device automatically regulates 25mV higher than the Hammer specs avoiding the use of any external offset resistor
1.000
0.975
0.950
0.925
0.900
0.875
0.850
0.825
Shutdown
bso ProReference Schematic
t(s) - O oleteVin
sGNDin
Product(s) - ObL1
Obsolettee ProducS4
leS3
S2
o S1
Obs S0
HS1
LS1
VCCDR
2
VCC
6
BOOT1
UGATE1
5
4
BOOT2
24
UGATE2
25
HS2
PHASE1
3
PHASE2
26
LGATE1
1
LGATE2
27
LS2
ISEN1
13
Rg
ISEN2
16
Rg
L6919EPGNDS1
14
PGNDS2
15
Rg PGND
28
Rg
VID4
VID3
VID2
VID1
VID0
OSC / INH
22
21
20
19
18
17
PGOOD
23
VSEN
10
FB
9
RFB
RF
CIN
L2
COUT
LOAD
PGOOD
SGND
7
CF
COMP
8
11 12
FBR
FBG
5/33
5 Page 
L6919E
Figure 4. Current Reading Timing (Left) and Circuit (Right)
ILS1
LGATEX
ILS2 Rg
ISENX
Total current
information
IISENx
Rg
t(s)Track &Hold
PGNDSX
50µA
ucWhere RSENSE is an external sense resistor or the rds,on of the low side mosfet and Rg is the transconductance
dresistor used between ISENx and PGNDSx pins toward the reading points; IPHASE is the current carried by each
ro )phase and, in particular, the current measured in the middle of the oscillator period
P t(sThe current information reproduced internally is represented by the second term of the previous equation as
te cfollow:
sole roduIINFOx
=
R-----S----E---N----S----E-----⋅---I-P----H----A----S---E--
Rg
b PSince the current is read in differential mode, also negative current information is kept; this allow the device to
- O techeck for dangerous returning current between the two phases assuring the complete equalization between the
) lephase's currents. From the current information of each phase, information about the total current delivered (IFB
t(s o=IINFO1 +IINFO2) and the average current for each phase (IAVG =(IINFO1 +IINFO2)/2 ) is taken. IINFOX is then com-
spared to IAVG to give the correction to the PWM output in order to equalize the current carried by the two phases.
c bThe transconductance resistor Rg can be designed in order to have current information of 25µA per phase at
u Ofull nominal load; the over current intervention threshold is set at 140% of the nominal (IINFOx = 35µA). According
d -to the above relationship, the over current threshold (IOCPx) for each phase, which has to be placed at one half
ro )of the total delivered maximum current, results:
te P ct(sIOCPx
=
3----5----µ----A-----⋅---R-----g--
RSENSE
Rg = I--O----C----P----x----⋅---R----S----E----N----S---E--
35 µ A
le duSince the device senses the output current across the low-side mosfets (or across a sense resistors in series
so rowith them) the device limits the bottom of the inductor current triangular waveform: an over current is detected
b Pwhen the current flowing into the sense element is greater than IOCPx (IINFOx > 35µA).
O leteIntroducing now the maximum ON time dependence with the delivered current (where T is the switching period
oT=1/fSW):
ObsTON,MAX
=
0.80 – (IFB ⋅ 5.73 k) ⋅ T
=
0.80
–
R-----S----E---N----S----E-
Rg
⋅
IOUT
⋅
5.73 k
⋅
0.80
T
0.40
⋅
⋅
T
T
IFB
IFB
=
=
0µA
70µA
This linear dependence has a value at zero load of 0.80·T and at maximum current of 0.40·T typical and results
in two different behaviors of the device:
11/33
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet L6919E.PDF ] | |
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