参数资料
| 型号： | LTC3816IFE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/44页 |
| 文件大小： | 0K |
| 描述： | IC CONTROLLER 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 |
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LTC3816
APPLICATIONS INFORMATION
1 +
R SEN
V CISR = I L ? R SEN ? ?
+
achieveaccuratecurrentsensing.Figure4showsareal
current sensing resistor, R SENSE , which can be modeled
with an ideal resistance, R SEN , in series with its parasitic
ESL. As shown in Figure 4, the voltage across the sense
resistor includes the voltage across the parasitic induc-
tor which is a strong function of inductor ripple current
and the switching frequency. This effectively reduces the
current limit threshold, typically by more than 30%. The
voltage across the sense resistor can be extracted from
a lowpass filter placed close to the controller input sense
pins as shown in Figure 4. The voltage across the sensing
capacitor, C ISR , is:
? sESL ?
? ?
? 1 + sR ISR ? C ISR ?
? ?
? ?
V IN
LTC3816
TG Q T
SW
BG Q B D
BSOURCE
R ISR
I SENP
C ISR
I SENN
R IMAX
I MAX
V ISR = V RSEN + V ESL
V ESL(ON)
V ESL(OFF)
L
V ISR
I L
ESL R SEN
V OUT
SENSE RESISTOR
C OUT
V RSEN = I L ? R SEN
R ISR ISR =
? C
V ESL ( ON ) + V ESL ( OFF )
? 1 1 ?
? I L ?
? t ON OFF ? ?
+
I L
TG Q T
+
I SENN
I L ( PEAK ) =
? I L I ? R ? I L
I LOAD ( MAX ) < I LIMIT = I L ( PE A K ) – = IMAX IMAX –
if R IDCR IDCR =
? C
R D CR
In the frequency domain, the second term in the above
equation must be equal to 1 to ensure that the voltage
across the filter capacitor is independent of operating
frequency. To meet this requirement, the value of the RC
filter should fulfill the following condition:
ESL
R SEN
The ESL value can be obtained from the manufacturer ’s
data sheet or estimated with an oscilloscope, as shown in
the Figure 4 waveform, using the following equation:
ESL =
t
where t ON is the TG on time and t OFF is the TG off time.
For high efficiency applications, the inductor DCR provides
a method of sensing the inductor current without incurring
additional power loss from a sense resistor. The DCR of
the inductor represents the small amount of resistance
in the copper winding, which can be less than 1m? for
today ’s low value, high current inductors. Figure 5 shows
a simplified inductor model, which can be modeled with an
ideal inductor, L, in series with its parasitic DCR. The DCR
value can be obtained from the inductor manufacturer ’s
3816 F04
Figure 4. Current Limit Sensing Using
a Low Value Sense Resistor
V IN
LTC3816
L DCR
SW V OUT
INDUCTOR
BG Q B D
C OUT
BSOURCE
R IDCR
I SENP
C IDCR
3916 F05
R IMAX
I MAX
Figure 5. Current Limit Sensing Using Inductor DCR
data sheet. Similar to the sense resistor application circuit,
the voltage across the inductor DCR can be extracted from
a lowpass filter and the current limit threshold is given by
the following equation:
I IMAX ? R IMAX
R DCR
2 R DCR 2
L
3816f
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