RT9238 Просмотр технического описания (PDF) - Richtek Technology
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RT9238 Datasheet PDF : 24 Pages
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RT9238
Preliminary
OVER-CURRENT TRIP:
VDS > VSET
iD ×R DS(ON) > IOCSET × ROCSET
OCSET
IOCSET
200µA
DRIVE
ROCSET
VSET+
VCC
UGATE
VIN = +5V
iD
VDS+
OC _
PWM
GATE
CONTROL
PHASE
VPHASE = VIN - VDS
VOCSET = VIN - VSET
Fig.6 Current Limiting Setting
OUT1 Voltage Program
The output voltage of the PWM converter is
programmed to discrete levels between 1.090V and
1.865V which are shifted high 40mV from 1.050V to
1.825V for voltage droop gap tuning. This output
(OUT1) is designed to supply the core voltage of
Intel’s advanced microprocessors. The voltage
identification (VID) pins program an internal voltage
reference (DACOUT) with a TTL-compatible 5-bit
digital-to-analog converter (DAC). The level of
DACOUT also sets the PGOOD and OVP thresholds.
Table 1 specifies the DACOUT voltage for the
different combinations of connections on the VID
pins. The VID pins can be left open for a logic 1 input,
since they are internally pulled to the VAUX pin
through 5KΩ resistors. Changing the VID inputs
during operation is not recommended and could
toggle the PGOOD signal and exercise the over-
voltage protection. The output voltage program is
Intel VRM8.5 compatible.
VID4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
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14
VID3
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
Table 1. VOUT1 Voltage Program
Pin Name
VID2
VID1
1
0
1
0
0
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
0
1
0
1
0
1
0
0
1
VID0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
VID25
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
Normal OUT1 Voltage
DACOUT
1.050+40mV=1.090
1.075+40mV=1.115
1.100+40mV=1.140
1.125+40mV=1.165
1.150+40mV=1.190
1.175+40mV=1.215
1.200+40mV=1.240
1.225+40mV=1.265
1.250+40mV=1.290
1.275+40mV=1.315
1.300+40mV=1.340
1.325+40mV=1.365
1.350+40mV=1.390
1.375+40mV=1.415
1.400+40mV=1.440
1.425+40mV=1.465
1.450+40mV=1.490
1.475+40mV=1.515
1.500+40mV=1.540
To be continued
DS9238-01 July 2001
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