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参数资料
| 型号： | ISL9506HRZ-T |
| 厂商： | Intersil |
| 文件页数： | 22/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 40-QFN |
| 标准包装： | 4,000 |
| 系列： | Robust Ripple Regulator™ (R³) |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 500kHz |
| 电源电压： | 4.75 V ~ 5.25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -10°C ~ 100°C |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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ISL9506
resistance difference in these two conditions as shown in
Equation 7:
inductor creates a small DC level of voltage. When this
voltage is summed with the other channels DC voltages, the
---------------- – ---------------- = 2.96k
1.24V 1.20V
54 μ A 60 μ A
(EQ. 7)
total DC load current can be derived.
RO is typically 5 to 10 Ω . This resistor is used to tie the
Therefore, proper NTC thermistor has to be chosen such
that 2.96k resistor change will be corresponding to required
temperature hysteresis. Regular external resistor may need
to be in series with NTC resistors to meet the threshold
voltage values.
The following is an example.
For Panasonic NTC thermistor with B = 4700, its resistance
will drop to 0.03322 of its nominal at 105°C, and drop to
0.03956 of its nominal at 100 °C. If the requirement for the
temperature hysteresis is (105-100) °C, the required
resistance of NTC will be:
outputs of all channels together and thus create a summed
average of the local CORE voltage output. RS is determined
through an understanding of both the DC and transient load
currents. This value will be covered in the next section.
However, it is important to keep in mind that the output of
each of these RS resistors are tied together to create the
VSUM voltage node. With both the outputs of RO and RS
tied together, the simplified model for the droop circuit can
be derived. This is presented in Figure 47.
Figure 47 shows the simplified model of the droop circuitry.
Essentially one resistor can replace the RO resistors of each
phase and one RS resistor can replace the RS resistors of
------------------------------------------------------ = 467k Ω
2.96k Ω
( 0.03956 – 0.03322 )
(EQ. 8)
each phase. The total DCR drop due to load current can be
replaced by a DC source, the value of which is given by
Equation 10.
Vdcr EQV = ----------------------------------
Therefore a larger value thermistor, such as 470k NTC
should be used.
I OUT × DCR
N
(EQ. 10)
At 105°C, 470k NTC resistance becomes:
(0.03322*470k) = 15.6k. With 60μA on NTC pin, the voltage
is only (15.6k*60μA) = 0.937V. This value is much lower than
the threshold voltage of 1.20V. Therefore, a resistor is
needed to be in series with the NTC. The required resistance
can be calculated by using Equation 9:
where N is the number of channels designed for nominal
operation. Another simplification was done by reducing the
NTC network comprised of R NTC , R SERIES and
R PARALLEL , given in Figure 46, to a single resistor given as
Rn as shown in Figure 47.
---------------- – 15.6k Ω = 4.4k Ω
1.20V
60 μ A
(EQ. 9)
The first step in droop impedance compensation is to adjust
Rn, RO EQV and RS EQV such that sufficient droop voltage
exists even at light loads between the VSUM and VO’ nodes.
4.42k is a standard resistor value. Therefore, the NTC
branch should have a 470k NTC and 4.42k resistor in series.
The part number for the NTC thermistor is ERTJ0EV474J. It
is a 0402 package. NTC thermistor will be placed in the hot
spot of the board.
Static Mode of Operation - Static Droop using DCR
Sensing
As previously mentioned, the ISL9506 has an internal
differential amplifier which provides for extremely accurate
We recognize that these components form a voltage divider.
As a rule of thumb we start with the voltage drop across the
Rn network, VN, to be 0.57 x V DCR . This ratio provides for a
fairly reasonable amount of light load signal from which to
arrive at droop.
First we calculate the equivalent NTC network resistance,
Rn. Typical values that provide good performance are,
Rseries = 3.57k_1%, R PAR = 4.53k_1% and R NTC = 10k Ω
NTC, ERT-J1VR103J from Panasonic. Rn is then given by
Equation 11.
Rn = -------------------------------------------------------------------- = 3.4k Ω
voltage regulation at the point of load. The droop impedance
regulation is also very accurate, and the process of selecting
the components for the appropriate droop impedance is
( Rseries + Rntc ) × Rpar
Rseries + Rntc + Rpar
(EQ. 11)
explained here.
For DCR sensing, the process of compensation for DCR
resistance variation to achieve the desired droop impedance
has several steps and is somewhat iterative.
In Figure 46 we show a 3 phase solution using DCR
sensing. There are two resistors around the inductor of each
phase. These are labeled RS and RO. These resistors are
used to sense the DC voltage drop across each inductor.
Each inductor will have a certain level of DC current flowing
through it, this current when multiplied by the DCR of the
22
In our second step, we calculate the series resistance from
each phase to the V SUM node, labeled RS1, RS2 and RS3
in Figure 46.
FN6722.0
August 13, 2008
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