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参数资料
| 型号： | ISL9506HRZ-T |
| 厂商： | Intersil |
| 文件页数： | 26/27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
Assuming N = 3, Rdroop = 0.0021(V/A) as per the desired
specification, Rsense = 0.001 Ω , we obtain G2 = 6.3.
The values of Rdrp1 and Rdrp2 are selected to satisfy two
requirements. First, the ratio of Rdrp2 and Rdrp1 determine
the gain G2 = (Rdrp2/Rdrp1)+1. Second, the parallel
combination of Rdrp1 and Rdrp2 should equal the parallel
combination of the Rs resistors. Combining these
requirements gives:
Rdrp1 = G2/(G2-1) * Rs/N
Rdrp2 = (G2-1) * Rdrp1
In the example above, Rs = 7.68k, N = 3, and G2 = 6.3 so
Rdrp 3k and Rdrp2 is 15.8k Ω .
These values are extremely sensitive to layout. Once the
board has been laid out, some tweaking may be required to
adjust the full load droop. This is fairly easy and can be
accomplished by allowing the system to achieve thermal
equilibrium at full load, and then adjusting Rdrp2 to obtain
the desired droop value.
Power Monitor
A/D converters might have 100k Ω input impedance, 1k Ω
resistor will cause 1% error. As shown in Figure 36, when
the load is at 2.5A, PMON can still sink 0.6mA current. This
allows the RC filter capacitor to discharge when the load is at
low current, thus providing correct average power
information on the capacitor.
Fault Protection - Overcurrent Fault Setting
As previously described, the overcurrent protection of the
ISL9506 is related to the droop voltage. Previously we have
calculated that the Droop Voltage = I LOAD *Rdroop, where
Rdroop is the droop impedance. Knowing this relationship,
the overcurrent protection threshold can be set up as a
voltage droop level. Knowing this voltage droop level, one
can program in the appropriate drop across the Roc resistor.
This voltage drop will be referred to as Voc.
Once the droop voltage is greater than Voc, the PWM drives
will turn off and PGOOD will go low. The selection of Roc is
given in Equation 25. Assuming we desire an overcurrent trip
level, Ioc, of 55A, and knowing from the desired specification
that the droop impedance, Rdroop is 0.0021 (V/A), we can
then calculate for R OC as shown in Equation 25:
Roc = ------------------------------------- = ------------------------------- = 11.5k Ω
The power monitor signal tracks the inductor current. Due to
the dynamic operation of the load, the inductor current is
pulsating and the power monitor signal needs to be filtered.
Ioc × Rdroop 55 × 0.0021
10 μ A 10x10 – 6
(EQ. 25)
If the RC filter is followed by an A/D converter, the input
impedance of the A/D converter needs to be much larger
than the resistor used for the RC filter. Otherwise, the input
impedance of the A/D converter and the RC filter resistor will
construct a resistor divider causing the A/D converter
reading incorrect information. It is desirable to choose a
small RC filter resistor in order to reduce the resistor divider
effect. The ISL9506 comes with a very strong current sinking
capability, users can use k Ω resistors for the RC filter. Some
Voc
Note, if the droop impedance is not -0.0021 (V/A) in the
application, the overcurrent setpoint will differ from
predicted.
A capacitor may be added in parallel with R OC to improve
noise rejection but the Roc*capacitor time constant cannot
exceed 20μs. Do not remove R OC if overcurrent protection is
not desired. The maximum R OC is 30k.
10μA
OCSET
Roc
OC
-
+
VSUM
VSUM
RS
EQV
=
RS
N
+
INTERNAL TO
ISL9506
DROOP
-
DFB
1 -
-
Σ
+
+
1
+
+
DROOP
+
VN
Vrsense
EQV
=
Iout ×
Rsense
N
-
VDIFF
RTN
VSEN
VO'
VO'
RO
EQV
=
RO
N
All 48. U.S. products are FOR DROOP AND REMOTE and tested USING ISO9000 quality systems.
FIGURE Intersil EQUIVALENT MODEL manufactured, assembled SENSING utilizing DISCRETE RESISTOR SENSING
Intersil Corporation’s quality certifications can be viewed 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
26
FN6722.0
August 13, 2008
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| ISL9517HRZ-T | 功能描述:IC CHRGR VDC BATT 28-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 功能:电池监控器 电池化学:碱性，锂离子，镍镉，镍金属氢化物 电源电压:1 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 供应商设备封装:SOT-6 包装:带卷 (TR) |
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| ISL9518HRTZ | 功能描述:电池管理 TQFN ISL9518 NOTEBOOK BATRY CHRGR RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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