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參數(shù)資料
| 型號(hào)： | QPI-8LZ-01 |
| 廠商： | Vicor Corporation |
| 文件頁(yè)數(shù)： | 8/17頁(yè) |
| 文件大小： | 1498K |
| 描述： | IC HOT SWAP EMI FILTER 16LGA |
| 標(biāo)準(zhǔn)包裝： | 20 |
| 系列： | Picor®, QUIETPOWER® |
| 類型： | 熱交換開關(guān) |
| 應(yīng)用： | AdvancedTCA |
| 內(nèi)部開關(guān)： | 是 |
| 電流限制： | 6A |
| 電源電壓： | 36 V ~ 76 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | * |
| 供應(yīng)商設(shè)備封裝： | * |
| 包裝： | 管件 |
| 其它名稱： | 1102-1092-5 |
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C
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Picor Corporation ?picorpower.com
QPI-8
Rev 1.5, Page 8 of 17
QPI-8
QUIETPOWER
?/DIV>
Figure 15 - Simplified Hi-Voltage Boost Circuit for Charging Bulk Storage Capacitors.
The circuit in Figure 15 shows a simplified version of a
PWRGD enabled boost circuit. The bulk storage capacitance
(CBULK) is initially charged to BUS+, along with the CIN
capacitor, through the body diode of the PFET. Once these
capacitors are fully charged, PWRGD enables the boost
converter to slowly charge the bulk capacitance to the
desired hi-voltage. When a low QPI+ voltage is detected, the
BUS VOLTAGE MONITOR circuit enables the PFET to discharge
some of its energy into the load converters CIN capacitor and
to the load. When the QPI+ rail reaches a pre-determined
limit, it shuts off the PFET and the rail starts to drop again.
This circuit acts much like a ripple regulator and will maintain
the output load until either the BUS voltage is restored or the
energy of the bulk capacitor is depleted.
The QPI-8 has a current sensing circuit that shuts off the
internal pass FET if a high di/dt is sensed across its internal
inductor. To avoid triggering this function, the PFET should be
turned on in its linear region. Typically, a zener diode can be
used to regulate the V
G-S
of the PFET and the amount of
energy discharged from the bulk capacitance. The waveforms
in Figure 16 demonstrate a zero-volt bus transient and the
response of the hi-voltage boost circuit. The storage caps
provide energy to sustain the load, while the bus is at zero for
5ms. The input current (green, CH4) drops to zero while the
load current (violet, CH3) remains constant. The voltage
across the bulk storage caps (light blue, CH2) slowly decays
while input voltage to the converter (blue, CH1) is regulated.
It is critical to keep the load current on the converters input
capacitor to less than 25mA during the initial start-up. This
limit is set by the current limit level and the duty cycle of the
circuit breaker timer, which is about 99% off time. An
excessive load will discharge the bulk capacitors during the
off time to a level where the on time charging current will
never charge the capacitor to the full bus voltage. Only after
Powergood has been established should the load be enabled.
Figure 16 - 5ms, 0V transient with 200W Load. CH1 and CH2
are offset by 50V DC.
PI+PI-
PI+PI-BOOST
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