参数资料
型号: LTC3816EFE#PBF
厂商: Linear Technology
文件页数: 22/44页
文件大小: 0K
描述: IC DC-DC CTLR S-PHASE 38TSSOP
标准包装: 50
应用: 控制器,Intel IMVP-6,IMVP-6.5?
输入电压: 4.5 V ~ 36 V
输出数: 1
输出电压: 0.013 V ~ 1.5 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 38-TFSOP (0.173",4.40mm 宽)裸露焊盘
供应商设备封装: 38-TSSOP 裸露焊盘
包装: 管件
LTC3816
APPLICATIONS INFORMATION
A AVP ( SR ) = A G ( SR ) ? R SEN
and A G ( SR ) =
R VSR
R VS R VSR =
? C
TG Q T
+
R AVPSR
C VSR
I TC
+
I SENN
whereA AVP(SR) istheAVPgainwithsenseresistorcon-
figuration and A G(SR) is the sense resistor gain:
tt
R AVPSR
ESL
R SEN
Figure 9 shows the AVP configuration with current sense
implemented using the inductor DCR. The AVP DC transfer
function is:
V OUT = V DAC – A AVP(DCR) ? I L = V DAC – A G(DCR) ? I L ? R DCR
V IN
I L
L ESL R SEN
SW V OUT
SENSE RESISTOR
BG Q B D
LTC3816 C OUT
BSOURCE
I TCFB
R VSR
AITC
3916 F08
Figure 8. AVP Configuration with a Sense Resistor
A AVP ( DCR ) = A G ( DCR ) ? R DCR
and A G ( DCR ) =
R VDCR VDCR =
? C
+
where:
R VDCR
R AVPDCR
L
R DCR
TEMPERATURE COMPENSATED ACTIVE VOLTAGE
POSITIONING (AVP) WITH INDUCTOR DCR
TG
SW
BG
LTC3816
BSOURCE
I TCFB
– I TC
AITC
I SENN
V IN
Q T
Q B
D
C VDCR
I L
L DCR
INDUCTOR
R AVPDCR
R VDCR
+
3916 F09
V OUT
C OUT
TG Q T
+
R PAR
R SER
I TC
+
I SENN
TheinductorDCRAVPconfigurationimprovestheregula-
tor efficiency by eliminating the power losses associated
with a sense resistor. However, without proper temperature
compensation, the positive temperature coefficient of the
inductor DCR, 0.39%/°C, may compromise the output volt-
age accuracy. As the temperature of the inductor rises, its
DCR value increases, resulting in a greater V OUT droop rate
(higher AVP gain). To compensate for the DCR temperature
shift, replace the resistor R VDCR in Figure 9 with an NTC
resistor placed as close as possible to the inductor. Ideally,
the NTC resistor should have the same temperature as the
inductor. As temperature increases, the NTC resistance
drops, resulting in a reduction in the AITC amplifier voltage
gain. This compensates for the increase in DCR resistance
and maintains the AVP gain. The NTC resistor, however, is
highly nonlinear and must be linearized. Figure 10 shows
Figure 9. AVP Configuration with Inductor DCR Current Sense
V IN
I L
L DCR
SW V OUT
INDUCTOR
BG Q B D
R AVPDCRN NTC C OUT
LTC3816
BSOURCE
I TCFB
C VDCRN
AITC
3916 F10
Figure 10. AVP with Inductor DCR Current Sense
and NTC Temperature Compensation
3816f
  
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