參數(shù)資料
型號(hào)： PM6685TR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, QCC32
封裝： 5 X 5 MM, 1 MM HEIGHT, 0.50 MM PITCH, LEAD FREE, VFQFPN-32
文件頁(yè)數(shù)： 27/52頁(yè)
文件大?。?/td> 2536K
代理商： PM6685TR
PM6685
Monitoring and protections
33/52
8.5
Design guidelines
The design of a switching section starts from two parameters:
●
Input voltage range: in notebook applications it varies from the minimum battery
voltage, VINmin to the AC adapter voltage, VINmax.
●
Maximum load current: it is the maximum required output current, ILOAD(max).
8.6
Switching frequency
It’s possible to set 3 different working frequency ranges for the two sections:
200kHz/300kHz, 400kHz/500kHz, 600kHz/700kHz with FSEL pin.
Switching frequency mainly influences two parameters:
●
Inductor size: for a given saturation current and RMS current, greater frequency allows
to use lower inductor values, which means smaller size.
●
Efficiency: switching losses are proportional to frequency. High frequency generally
involves low efficiency.
8.7
Inductor selection
Once that switching frequency is defined, inductor selection depends on the desired
inductor ripple current and load transient performance.
Low inductance means great ripple current and could generate great output noise. On the
other hand, low inductor values involve fast load transient response.
A good compromise between the transient response time, the efficiency, the cost and the
size is to choose the inductor value in order to maintain the inductor ripple current
IL
between 20% and 50% of the maximum output current ILOAD(max). The maximum
IL
occurs at the maximum input voltage. With this considerations, the inductor value can be
calculated with the following relationship:
Table 10.
Protections and operatives modes
Mode
Conditions
Description
Overvoltage
protection
OUT5/OUT3 > 115% of the
nominal value
LGATE5/LGATE3 pin is forced high, LDO5 remains
active. Exit by a power on reset or toggling SHDN or
EN5/EN3
Undervoltage
protection
OUT5/OUT3 < 70% of the
nominal value
LGATE5/LGATE3 is forced high after the soft end
mode, LDO5 remains active. Exit by a power on reset
or toggling SHDN or EN5/EN3
Thermal
shutdown
TJ > +150°C
All circuitry off. Exit by a POR on VIN or toggling
SHDN.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PM6686 制造商:STMicroelectronics 功能描述:
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PM6-6F-L 功能描述:端子 Metric Fork Terminal non-insulated, 4.0 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點(diǎn)電鍍:Tin over Nickel 觸點(diǎn)材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp
PM6-6R-D 制造商:Panduit Corp 功能描述:
PM6-6R-L 功能描述:端子 Metric Ring Terminal non-insulated, 2.5 RoHS:否 制造商:AVX 產(chǎn)品:Junction Box - Wire to Wire 系列:9826 線規(guī):26-18 接線柱/接頭大小: 絕緣: 顏色:Red 型式:Female 觸點(diǎn)電鍍:Tin over Nickel 觸點(diǎn)材料:Beryllium Copper, Phosphor Bronze 端接類型:Crimp
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