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| 型号： | ISL6329CRZ |
| 厂商： | Intersil |
| 文件页数： | 14/38页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM SYNC BUCK DL 60QFN |
| 标准包装： | 43 |
| 应用： | 控制器，AMD SVI |
| 输入电压： | 5 V ~ 12 V |
| 输出数： | 2 |
| 输出电压： | 0.0125 V ~ 1.55 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
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ISL6329
L
Continuous Current Sampling
In order to realize proper current-balance, the currents in each
channel are sampled continuously every switching cycle. During
this time, the current-sense amplifier uses the ISEN inputs to
reproduce a signal proportional to the inductor current, I L . This
sensed current, I SEN , is simply a scaled version of the inductor
current.
MOSFET
DRIVER
UGATE(n)
LGATE(n)
V IN
I
n
L
DCR
INDUCTOR
V L (s)
V C (s)
V OUT
C OUT
ISL6329 INTERNAL
R 1
C
R 2
PWM
CIRCUIT
ISENn-
SWITCHING PERIOD
I L
I n
+
-
ISENn+
C ISEN
V C (s)
R ISEN
I SEN
FIGURE 4. INDUCTOR DCR CURRENT SENSING
CONFIGURATION
I SEN
multiplied by the ratio of the resistor divider, K. If a resistor
divider is not being used, the value for K is 1.
L R 1 ? R 2
R 1 + R 2
TIME
------------- = --------------------- ? C
DCR
(EQ. 8)
(EQ. 9)
I SEN = I L ? ------------------
V L ( s ) = I L ? ( s ? L + DCR )
? ------------- + 1 ?
V C ( s ) = -------------------------------------------------------- ? K ? DCR ? I L (EQ. 6)
? ( R 1 ? R 2 ) ?
R 2 (EQ. 7)
I Load DCR
I AVG = -------------- ? ------------------
R ISEN
FIGURE 3. CONTINUOUS CURRENT SAMPLING
The ISL6329 supports Inductor DCR current sensing to continuously
sample each channel’s current for channel-current balance. The
internal circuitry shown in Figure 4 represents Channel n of an
n-Channel converter. This circuitry is repeated for each channel in
the converter, but may not be active depending on how many
channels are operating.
Inductor windings have a characteristic distributed resistance or
DCR (Direct Current Resistance). For simplicity, the inductor DCR
is considered as a separate lumped quantity, as shown in Figure
4. The channel current I Ln , flowing through the inductor, passes
through the DCR. Equation 5 shows the S-domain equivalent
voltage, V L , across the inductor.
(EQ. 5)
n
A simple R-C network across the inductor (R 1 , R 2 and C) extracts
the DCR voltage, as shown in Figure 6. The voltage across the
sense capacitor, V C , can be shown to be proportional to the
channel current I Ln , shown in Equation 6.
s ? L
? DCR ?
n
? s ? ------------------------ ? C + 1 ?
? R 1 + R 2 ?
Where:
K = ---------------------
R 2 + R 1
If the R-C network components are selected such that the RC
time constant matches the inductor L/DCR time constant (see
Equation 8), then V C is equal to the voltage drop across the DCR
The capacitor voltage V C , is then replicated across the effective
internal sense resistor, R ISEN . This develops a current through
R ISEN which is proportional to the inductor current. This current,
I SEN , is continuously sensed and is then used by the controller for
load-line regulation, channel-current balancing, and overcurrent
detection and limiting. Equation 9 shows that the proportion
between the channel current, I L , and the sensed current, I SEN , is
driven by the value of the effective sense resistance, R ISEN , and
the DCR of the inductor.
DCR
R ISEN
The Northbridge regulator samples the load current in the same
manner as the Core regulator does.
The sampled currents, I n , from each active channel are summed
together and divided by the number of active channels. The resulting
cycle average current, I AVG , provides a measure of the total
load-current demand on the converter during each switching cycle.
Assuming that the current in all the active channels is balanced, the
average sensed current can be calculated from Equation 10.
(EQ. 10)
N
In the ISL6329, the average scaled version of the load current,
I AVG , has a 100 μ A range. At 100 μ A, the Overcurrent Protection
maximum load current correlate to an average sensed current,
I AVG , of 80 μ A.
A capacitor, C ISEN , should be placed between the ISENn+ pin and
ground. The value of the capacitor can be calculated using
Equation 11.
C ISEN = ------------------
14
9.5ns
R ISEN
(EQ. 11)
FN7800.0
April 19, 2011
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| ISL6329CRZ-T | 功能描述:电压模式 PWM 控制器 6+1 PHS DL PWM CONTRLR FOR CORE RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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| ISL6329IRZ-T | 功能描述:电压模式 PWM 控制器 6+1 PHS DL PWM CONTRLR FOR CORE RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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