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參數(shù)資料
| 型號(hào)： | DRV591GQE |
| 英文描述： | Analog IC |
| 中文描述： | 模擬IC |
| 文件頁(yè)數(shù)： | 12/19頁(yè) |
| 文件大?。?/td> | 256K |
| 代理商： | DRV591GQE |
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DRV591
SLOS389
–
NOVEMBER 2001
12
www.ti.com
APPLICATION INFORMATION
LC filter in the frequency domain (continued)
HLP dB
40 log
fs
fo
fo
1
2
LC
fs
500 kHz (DRV591 switching frequency)
If L=10
μ
H and C=10
μ
F, the cutoff frequency is 15.9 kHz, which corresponds to
–
60 dB of attenuation at the
500 kHz switching frequency. For VDD = 5 V, the amount of ripple voltage at the TEC element is approximately
5 mV.
The average TEC element has a resistance of 1.5
, so the ripple current through the TEC is approximately
3.4 mA. At the 3-A maximum output current of the DRV591, this 5.4 mA corresponds to 0.11% ripple current,
causing less than 0.0001% reduction of the maximum temperature differential of the TEC element (see
equation 1).
LC filter in the time domain
The ripple current of an inductor may be calculated using equation (4):
IL
VO
VTECDTs
L
D
duty cycle (0.5 worst case)
Ts
1 fs
1 500 kHz
For V
O
= 5 V, V
TEC
= 2.5 V, and L = 10
μ
H, the inductor ripple current is 250 mA. To calculate how much of that
ripple current will flow through the TEC element, however, the properties of the filter capacitor must be
considered.
For relatively small capacitors (less than 22
μ
F) with very low equivalent series resistance (ESR, less than
10 m
), such as ceramic capacitors, the following equation (5) may be used to estimate the ripple voltage on
the capacitor due to the change in charge:
VC
2
2
(1
–
D)
fo
fs
2
VTEC
fo
1
2
LC
fs
500 kHz
D
duty cycle
(3)
(4)
(5)
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| DRV591VFP | 功能描述:功率驅(qū)動(dòng)器IC High Efficiency PWM Power Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| DRV591VFP(1) | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-A HIGH-EFFICIENCY PWM POWER DRIVER |
| DRV591VFP | 制造商:Texas Instruments 功能描述:PWM POWER DRIVER SMD HLQFP32 591 |
| DRV591VFP1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3-A HIGH-EFFICIENCY PWM POWER DRIVER |
| DRV591VFPG4 | 功能描述:功率驅(qū)動(dòng)器IC High Efficiency PWM Power Driver RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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