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参数资料
| 型号： | ISL62871HRUZ-T |
| 厂商： | Intersil |
| 文件页数： | 19/25页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-TQFN |
| 标准包装： | 3,000 |
| 系列： | Robust Ripple Regulator™ (R³) |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 100% |
| 电源电压： | 3.3 V ~ 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： | 16-UFQFN |
| 包装： | 带卷 (TR) |
ISL62871, ISL62872
.
2.0
1.8
1.6
1000
900
800
Q U =100nC
Q L =200nC
Q U =50nC
Q L =100nC
Q U =50nC
Q L =50nC
1.4
700
1.2
1.0
0.8
600
500
400
Q U =20nC
Q L =50nC
0.6
0.4
0.2
20nC
Q GATE = 100nC
300
200
100
0.0
0.0
0.1
0.2
0.3
0.4 0.5 0.6
0.7
0.8
0.9
1.0
0
0
200
400
600
800 1k
1.2k 1.4k 1.6k 1.8k 2k
DV BOOT_CAP (V)
FIGURE 15. BOOT CAPACITANCE vs BOOT RIPPLE VOLTAGE
Driver Power Dissipation
Switching power dissipation in the driver is mainly a function
of the switching frequency and total gate charge of the
selected MOSFETs. Calculating the power dissipation in the
driver for a desired application is critical to ensuring safe
operation. Exceeding the maximum allowable power
dissipation level will push the IC beyond the maximum
recommended operating junction temperature of +125°C.
When designing the application, it is recommended that the
following calculation be performed to ensure safe operation
at the desired frequency for the selected MOSFETs. The
power dissipated by the drivers is approximated as
Equation 38:
FREQUENCY (Hz)
FIGURE 16. POWER DISSIPATION vs FREQUENCY
MOSFET Selection and Considerations
Typically, a MOSFET cannot tolerate even brief excursions
beyond their maximum drain to source voltage rating. The
MOSFETs used in the power stage of the converter should
have a maximum V DS rating that exceeds the sum of the
upper voltage tolerance of the input power source and the
voltage spike that occurs when the MOSFET switches off.
There are several power MOSFETs readily available that are
optimized for DC/DC converter applications. The preferred
high-side MOSFET emphasizes low switch charge so that
the device spends the least amount of time dissipating
power in the linear region. Unlike the low-side MOSFET
which has the drain-source voltage clamped by its body
P = F sw ( 1.5V U Q U + V L Q L ) + P L + P U
Where:
(EQ. 38)
diode during turn-off, the high-side MOSFET turns off with
V IN - V OUT , plus the spike, across it. The preferred low-side
MOSFET emphasizes low r DS(ON) when fully saturated to
minimize conduction loss.
V L is the lower gate driver bias supply voltage
P CON_LS ≈ I LOAD ? r DS ( ON ) _LS ? ( 1 – D )
- F sw is the switching frequency of the PWM signal
- V U is the upper gate driver bias supply voltage
-
- Q U is the charge to be delivered by the upper driver into
the gate of the MOSFET and discrete capacitors
- Q L is the charge to be delivered by the lower driver into
the gate of the MOSFET and discrete capacitors
- P L is the quiescent power consumption of the lower
driver
For the low-side MOSFET, (LS), the power loss can be
assumed to be conductive only and is written as
Equation 39:
2
(EQ. 39)
For the high-side MOSFET, (HS), its conduction loss is
written as Equation 40:
P CON_HS = I LOAD ? r DS ( ON ) _HS ? D
- P U is the quiescent power consumption of the upper
2
(EQ. 40)
P SW_HS = ---------------------------------------------------------------------- + ------------------------------------------------------------------
driver
For the high-side MOSFET, its switching loss is written as
Equation 41:
V IN ? I VALLEY ? t ON ? F SW V IN ? I PEAK ? t OFF ? F SW
2 2
(EQ. 41)
19
FN6707.0
August 14, 2008
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| ISL62872HRUZ | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:PWM DC/DC Controller With VID Inputs For Portable GPU Core-Voltage Regulator |
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| ISL62873 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:PWM DC/DC Controller with VID Inputs for Portable GPU Core-Voltage Regulator |
| ISL62873HRUZ-T | 功能描述:IC REG CTRLR BUCK PWM 16UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:Robust Ripple Regulator™ (R³) 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:275kHz 占空比:50% 电源电压:18 V ~ 110 V 降压:无 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:是 工作温度:-40°C ~ 85°C 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) |
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