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參數(shù)資料
| 型號： | ISL6253 |
| 廠商： | Intersil Corporation |
| 英文描述： | Highly Integrated Battery Charger for Notebook Computers |
| 中文描述： | 高度集成的電池充電器用于筆記本電腦 |
| 文件頁數(shù)： | 17/22頁 |
| 文件大小： | 549K |
| 代理商： | ISL6253 |
17
Choose a low-side MOSFET that has the lowest possible
on-resistance, has a moderate-sized package like SO-8 and
is reasonably priced. The switching losses are not an issue
for the low side MOSFET because it operates at zero-
voltage-switching.
Choose a Schottky diode in parallel with low-side MOSFET
Q2 with a forward voltage drop low enough to prevent the
low-side MOSFET Q2 body-diode from turning on during the
dead time. This also reduces the power loss in the high-side
MOSFET associated with the reverse recovery of the low-
side MOSFET Q2 body diode.
As a general rule, select a diode with a DC current rating
equal to one-third of the load current. One option is to
choose a combined MOSFET and Schottky diode in a single
package. The integrated packages may work better in
practice because there is less stray inductance due to a
short connection. This Schottky diode is optional and may be
removed if efficiency loss can be tolerated. In addition,
ensure that the required total gate drive current for the
selected MOSFETs is less than 26mA. The total gate charge
for the high-side and low-side MOSFETs is limited by the
following equation:
where I
GATE
is the total gate drive current and should be
less than 26mA. Substituting I
GATE
= 26mA and f
s
= 300kHz
into the above equation yields a total gate charge which
should be less than 86nC; therefore, the ISL6253 easily
drives the battery charge current up to 10A.
Input Capacitor Selection
The input capacitor absorbs the ripple current from the
synchronous buck converter, which is given by:
This RMS ripple current must be smaller than the rated RMS
current in the capacitor data sheet. Non-tantalum
chemistries (ceramic, aluminum, or OSCON) are preferred
due to their resistance to power-up surge currents when the
AC adapter is plugged into the battery charger. For
Notebook battery charger applications, a ceramic capacitor
or a polymer capacitor from Sanyo is recommended due to
its small size and reasonable cost.
Table 2 shows the component lists for the typical application
circuit in Figure 18.
Loop Compensation Design
ISL6253 uses constant frequency current mode control
architecture to achieve fast loop transient response.
Accurate current sensing resistors in series with the output
inductor is used to regulate the charge current, and the
sensed current signal is injected into the voltage loop to
achieve current mode control to simplify the loop
compensation design. The inductor is not considered as a
state variable for current mode control, and the system
becomes a single order system. It is much easier to design a
type II compensator to stabilize the voltage loop than voltage
mode control.
Figure 19 shows the small signal model of the synchronous
buck regulator.
Q
GATE
I
s
----------------
≤
(EQ. 16)
I
rms
I
BAT
V
V
----------------------------------------------------
V
–
(
)
IN
=
(EQ. 17)
TABLE 2. COMPONENT LIST
PARTS
PART NUMBERS AND MANUFACTURER
C1, C2
10
μ
F/25V ceramic capacitor,
TDK, C4532X7R1E106M
C3, C5, C9, C12 0.1
μ
F/50V ceramic capacitor
C4, C8, C10
1
μ
F/10V ceramic capacitor,
Taiyo Yuden LMK212BJ105MG
C6
10nF ceramic capacitor
C7
6.8nF ceramic capacitor
C11
10
μ
F or 22
μ
F/25V/10m
ceramic capacitor
TDK, C5750X7R1E226M
D1
30V/3A Schottky Diode, EC31QS03L, Nihon
(optional)
D2, D3
100mA/30V Schottky Diode, Central
Semiconductor
L
15
μ
H/4.5A/20m
, Sumida, CDRH127-150
Q1
30V/14m
, IRF7811AV, International Rectifier
Q2
30V/30m
, FDS6612A, Fairchild
Q3
-30V/9.5m
, Si4413DY, Siliconix
R1
25m
,
±
1%, LRC-LR2010-01-R025-F, IRC
R2
20m
,
±
1%, LRC-LR2010-01-R020-F, IRC
R3
18
,
±
5%, (0805)
R4
2.2
,
±
5%, (0805)
R5
100k
,
±
5%, (0805)
R6
10k,
±
5%, (0805)
R7
4.7
, ±
5%, (0805)
R8
130k
,
±
1%, (0805)
R9
10.2k
,
±
1%, (0805)
R10, R11, R12
10k
,
±
5%, (0805)
R13
100
,
±
5%, (0805)
R14
100k
,
±
5%, (0805)
ISL6253
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL6253HAZ | Highly Integrated Battery Charger for Notebook Computers |
| ISL6253HRZ | Highly Integrated Battery Charger for Notebook Computers |
| ISL6269A | High-Performance Notebook PWM Controller(高性能筆記本PWM控制器) |
| ISL6271ACRZ | Integrated XScale Regulator |
| ISL6271ACRZ-T | Integrated XScale Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6253EVAL1 | 功能描述:EVALUATION BOARD 1 ISL6253 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ISL6253EVAL1Z | 功能描述:EVALUATION BOARD 1 ISL6253 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 評估演示板和套件 系列:* 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| ISL6253HA | 制造商:Intersil Corporation 功能描述:NOTEBOOK BATTERY CHARGER, -10 TO +100, 28LD SSOP - Rail/Tube |
| ISL6253HA-T | 制造商:Intersil Corporation 功能描述:NOTEBOOK BATTERY CHARGER, -10 TO +100, 28LD SSOP, T&R - Tape and Reel |
| ISL6253HAZ | 功能描述:IC CTRLR BATTERY CHARGER 28QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:Impedance Track™ 功能:燃料，電量檢測計/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.4 V ~ 2.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:帶卷 (TR) 產(chǎn)品目錄頁面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名稱:296-21665-2 |
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