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参数资料
| 型号： | ISL6565BCVZ-T |
| 厂商： | Intersil |
| 文件页数： | 22/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 28TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 66.7% |
| 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： | 0°C ~ 105°C |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
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ISL6565A, ISL6565B
? T 2
important to note that when using Equations 33 and 34 the
resistor divider ratio of the corresponding phase RC network
is being changed. In the phase being adjusted, this new ratio,
K new (described in Equation 35), can not exceed 1.0.
? T 1 (EQ. 35)
K new = K ----------
If this occurs, the current in the hot phase cannot be reduced
any more. Instead of decreasing the current in the hot phase,
the current must be increased in the colder phases. To
accomplish this, use Equations 33 and 34 to get the desired
temperature rise in the cold phases.
While a single adjustment, according to Equations 33 and 34,
is usually sufficient, it may occasionally be necessary to adjust
R 1 and R 2 in the corresponding channels two or more times
to achieve optimal thermal balance between all phases.
Load-Line Regulation Resistor
The load-line regulation resistor is labeled R FB in Figure 7.
Its value depends on the desired full-load droop voltage
(V DROOP in Figure 7). Once the ISEN resistor has been
chosen, the load-line regulation resistor can be calculated
temperature. Resistance is normalized to the value at 25°C
and the value of α is typically between 0.35%/°C and
0.50%/°C.
According to Equation 38, a voltage regulator with 80%
thermal coupling coefficient between the controller and lower
MOSFET and 0.4%/°C temperature coefficient of MOSFET
r DS(ON) requires a 2.5k ? TCOMP resistor.
If the exact value for K T and α are not known, Equation 38
can give an incorrect value for R TCOMP . If this is the case,
follow the steps below to obtain an accurate value for
R TCOMP . This procedure works by making two output
voltage measurements. The first is made by using too much
temperature compensation, and the second with too little.
Each of the measurements produces an error and a linear
interpolation is used to find a TCOMP resistor value to
produce zero error. Make all measurements using a digital
multimeter accurate to 100 μ V or better.
1. Install a 5k ? resistor (R 1 ) for R TCOMP .
2. Start the regulator at room temperature and apply full
load current. Record the output voltage, V 1 , immediately
after loading the regulator.
V DROOP
using Equation 36.
– 6
R FB = -------------------------
70 × 10
(EQ. 36)
3. Allow the board to heat until the output voltage stabilizes
(usually several minutes). Record the output voltage, V 2 .
4. Install a 1k ? resistor (R 2 ) for R TCOMP .
5. Start the regulator at room temperature and apply full
If one or more of the ISEN resistors is adjusted for thermal
balance, as in Equation 26, the load-line regulation resistor
should be selected according to Equation 37 where I FL is the
full-load operating current and R ISEN(n) is the ISEN resistor
connected to the n th ISEN pin.
load current. Record the output voltage, V 3 , immediately
after loading the regulator.
6. Allow the board to heat until the output voltage stabilizes
(usually several minutes). Record the output voltage, V 4 .
7. Calculate the correct value for R TCOMP using
Equation 39.
R FB = --------------------------------
R TCOMP = R 1 – ( R 1 – R 2 ) --------------------------------------------------------
( V – V ) + ( V – V )
V DROOP
I FL r DS ( ON )
∑ R ISEN ( n )
n
(EQ. 37)
2 1 3 4
( V 2 – V 1 )
(EQ. 39)
α
K T K TC
Temperature Compensation Resistor
By combining Equations 17 and 18 found in the Temperature
Compensation section, the value of the TCOMP resistor can
be determined using Equation 38.
R TCOMP = ---------------------- (EQ. 38)
In Equation 38, K T is the temperature coupling coefficient
between the ISL6565A and the closest lower MOSFET, or
the ISL6565B and the output inductor. It represents how
closely the controller temperature tracks the lower MOSFET
or inductor temperature. The value of K T is typically between
75% and 100%. K TC is the temperature dependant
transconductance of the internal compensation circuit. Its
value is designed as 2 μ A/V/°C. The temperature coefficient
of MOSFET r DS(ON) or inductor DCR is given by α . This is
the ratio of the change in resistance to the change in
22
Compensation
The two opposing goals of compensating the voltage
regulator are stability and speed.
The load-line regulated converter behaves in a similar
manner to a peak-current mode controller because the two
poles at the output-filter L-C resonant frequency split with
the introduction of current information into the control loop.
The final location of these poles is determined by the system
function, the gain of the current signal, and the value of the
compensation components, R C and C C .
FN9135.4
December 1, 2005
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