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参数资料
| 型号： | ISL6420BIRZ-TK |
| 厂商： | Intersil |
| 文件页数： | 19/21页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 20-QFN |
| 标准包装： | 1,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.4MHz |
| 占空比： | 100% |
| 电源电压： | 4.5 V ~ 28 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： | 20-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
ISL6420B
shows a more specific formula for determining the input
P UFET = I O ? r DS ( ON ) ? D + --- I O ? V IN ? t sw ? f sw
ripple:
2 1
2
(EQ. 15)
I RMS = I MAX ? ( D – D )
(EQ. 14)
P LFET = I O ? r DS ( ON ) ? ( 1 – D )
(EQ. 16)
2
For a through hole design, several electrolytic capacitors
(Panasonic HFQ series or Nichicon PL series or Sanyo
MV-GX or equivalent) 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. The TPS
series available from AVX, and the 593D series from
Sprague are both surge current tested.
MOSFET Selection/Considerations
The ISL6420B requires 2 N-Channel power MOSFETs.
These should be selected based upon r DS(ON) , gate
supply requirements, and thermal management
requirements.
In high-current applications, the MOSFET power
dissipation, package selection and heatsink are the
dominant design factors. The power dissipation includes
two loss components; conduction loss and switching loss.
The conduction losses are the largest component of
power dissipation for both the upper and the lower
MOSFETs. These losses are distributed between the two
MOSFETs according to duty factor (see Equations 15 and
16). Only the upper MOSFET has switching losses, since
the Schottky rectifier clamps the switching node before
the synchronous rectifier turns on.
19
2
Where D is the duty cycle = Vo/VIN, t SW is the switching
interval, and f SW is the switching frequency.
These equations assume linear voltage-current
transitions and do not adequately model power loss due
the reverse recovery of the lower MOSFET’s body diode.
The gate-charge losses are dissipated by the ISL6420B
and don't heat the MOSFETs. However, large
gate-charge increases the switching interval, t SW which
increases the upper MOSFET switching losses. Ensure
that both MOSFETs are within their maximum junction
temperature at high ambient temperature by calculating
the temperature rise according to package
thermal-resistance specifications. A separate heatsink
may be necessary depending upon MOSFET power,
package type, ambient temperature and air flow.
Schottky Selection
Rectifier D 2 is a clamp that catches the negative
inductor swing during the dead time between turning off
the lower MOSFET and turning on the upper MOSFET.
The diode must be a Schottky type to prevent the
parasitic MOSFET body diode from conducting. It is
acceptable to omit the diode and let the body diode of
the lower MOSFET clamp the negative inductor swing,
but efficiency will drop one or two percent as a result.
The diode's rated reverse breakdown voltage must be
greater than the maximum input voltage.
FN6901.1
December 4, 2009
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6420BMAEP | 制造商:Intersil Corporation 功能描述:VOLT MODE PWM CNTRLR 20QSOP W - Rail/Tube |
| ISL6420BMAEP-TK | 制造商:Intersil Corporation 功能描述:VOLT MODE PWM CNTRLR 20QSOP W - Tape and Reel |
| ISL6420EVAL3 | 功能描述:EVALUATION BOARD 3 ISL6420 RoHS:否 类别:编程器，开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像，彩色（RGB） 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压: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 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| ISL6420IA | 功能描述:IC REG CTRLR BUCK PWM VM 20-QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- 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:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| ISL6420IA-TK | 功能描述:IC REG CTRLR BUCK PWM VM 20-QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- 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:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
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