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| 型号： | ISL6567IRZ-TS2698 |
| 厂商： | Intersil |
| 文件页数： | 24/25页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 24-QFN |
| 标准包装： | 6,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 66% |
| 电源电压： | 4.9 V ~ 5.5 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： | -40°C ~ 85°C |
| 封装/外壳： | 24-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
ISL6567
Find the intersection of the active channel curve and duty cycle
for your particular application. The resulting ripple current
multiplier from the y-axis is then multiplied by the
normalization factor, K NORM , to determine the total output
ripple current for the given application.
Use a mix of input bypass capacitors to control the input
voltage ripple. Use ceramic capacitance for the high
frequency decoupling and bulk capacitors to supply the RMS
current. Minimize the connection path inductance of the high
frequency decoupling ceramic capacitors (from drain of
Δ I TOTAL = K NORM ? K CM
(EQ. 33)
upper MOSFET to source of lower MOSFET).
For bulk capacitance, several electrolytic or high-capacity MLC
INPUT CAPACITOR SELECTION
The important parameters for the bulk input capacitors are
the voltage rating and the RMS current rating. For reliable
operation, select bulk input capacitors with voltage and
current ratings above the maximum input voltage and largest
RMS current required by the circuit. The capacitor voltage
rating should be at least 1.25 times greater than the
maximum input voltage. The input RMS current required for a
multi-phase converter can be approximated with the aid of
Figure 28. For a more exact calculation of the input RMS
current use Equation 34.
capacitors may be needed. For surface mount designs, solid
tantalum capacitors can be used, but caution must be exercised
with regard to the capacitor surge current rating. These capacitors
must be capable of handling the surge-current at power-up.
APPLICATION SYSTEM DC TOLERANCE
Although the ISL6567 features a tight voltage reference, the
overall system DC tolerance can be affected by the tolerance
of the other components employed. The resistive divider used
to set the output voltage will directly influence the system DC
voltage tolerance. Figure 29 details the absolute worst case
tolerance stack-up for 1% and 0.1% feedback resistors, and
I O ? ( D – D ) + I L , PP ? -------
REF TM ? --------------------------------------------------------- – 1
k ? R PTM
TOL = ------------------------------------------------------------------------------------------ [%]
I IN ( RMS ) =
0.3
0.2
2 2 2 D
12
(EQ. 34)
assuming the ISL6567 is regulating at 0.8% above its nominal
reference. Other component tolerance stack-ups may be
investigated using the following equation, where REF TM , R PTM ,
and R STM are the tolerance multipliers corresponding to V REF ,
R S , and R P , respectively.
( k – 1 ) ? R STM + R PTM
(EQ. 35)
100
2.8
2.6
R STM = 1.01
0.1
I L,PP = 0
I L,PP = 0.5 x I O
I L,PP = 0.75 x I O
2.4
2.2
2.0
1.8
R PTM = 0.99
REF TM = 1.008
0
0
0.1
0.2
0.3
0.4
0.5
1.6
DUTY CYCLE (V O /V IN )
FIGURE 28. NORMALIZED INPUT RMS CURRENT vs DUTY CYCLE
FOR A 2-PHASE CONVERTER
1.4
1.2
1.0
R STM = 1.001
R PTM = 0.999
REF TM = 1.008
As the input capacitors are responsible for sourcing the AC
component of the input current flowing into the upper
MOSFETs, their RMS current capacity must be sufficient to
0.8
1
2
3
4
5 6
k = V OUT /V REF
7
8
9
10
handle the AC component of the current drawn by the upper
MOSFETs. Figure 28 can be used to determine the
input-capacitor RMS current function of duty cycle, maximum
FIGURE 29. WORST CASE SYSTEM DC REGULATION TOLERANCE
(V REF AT 0.8% ABOVE NOMINAL)
sustained output current (I O ), and the ratio of the peak-to-peak
inductor current (I L,PP ) to the maximum sustained load
current, I O .
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
in the quality certifications found at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
24
FN9243.4
August 9, 2011
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