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| 型号： | ISL6144EVAL1Z |
| 厂商： | Intersil |
| 文件页数： | 17/30页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD ISL6144 ORING |
| 标准包装： | 1 |
| 主要目的： | 电源管理，O 环控制器/负荷分载 |
| 已用 IC / 零件： | ISL6144 |
| 已供物品： | 板 |
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ISL6144
DC/DC Converter Power Board (not part of the
ISL6144EVAL1Z board)
The DC/DC converter board consists of two DC/DC
converters with independent input voltage rails. In reality, two
identical power supplies can be used in the test setup to
replace this board (contact Intersil Applications Engineering
if you need assistance in your test setup). This DC/DC
converter board is configured for operation at different output
voltage levels depending on the choice of DC/DC modules.
Most evaluation results are provided for a mix of +48V and
+12V input voltages. Any other voltage within the +9V to
+75V range can also be used.
Each DC/DC converter has a low r DS(ON) MOSFET
connected in parallel to the output terminals. This MOSFET
is normally off. When turned on it simulates a short across
the output. Another MOSFET is connected at the ON/OFF
pin of the modules to simulate a slow turn-off of the module.
Single-Feed Evaluation
The ISL6144EVAL1Z is hooked up to two input power
supplies using test setup shown in Figure 16 or Figure 17.
Note that the ISL6144EVAL1Z is populated with one
FDB3632 MOSFET per feed (Nominal value of the
MOSFET’s r DS(ON) is approximately 8m Ω at V GS = 10V).
1. Connect the input power supplies, auxiliary 5V power
supply, load and output capacitor to the ISL6144EVAL1Z.
2. Connect test equipment (Oscilloscope, DMM) to the
signals of interest using on-board test points and scope
probe jacks.
3. Turn-on PS1 with V IN1 = +48V (V IN1 can be any voltage
within +9V to +75V). Turn-on the auxiliary power supply
(AUX PS powering the LED circuit) with +5V. Adjust load
current to 2A. Verify the main operational parameters
such as the 20mV forward regulation at light loads, and
gate voltage as a function of load current.
4. The forward voltage drop across the MOSFET terminals
V SD1 (TP1-TP2) is equal to the maximum of the 20mV
forward regulated voltage drop across the source-drain
“V FWD_HR “ or the product of the load current and the
MOSFET on-state resistance “I Load * r DS(ON) ”.
5. For I Load = 2A, V SD1 is equal to V FWD_HR = 20mV. The
gate-source voltage is modulated as a function of load
current and MOSFET transconductance. Gate-source
voltage V GS1 (TP13 -TP17) is approximately 4V. In this
case, LED1 is off. LED2 will be RED as V IN2 is still off.
6. Increase the load current I Load to 4A. Note that V DS1 is
increased to above V FWD_HR and operation in the 20mV
forward regulation cannot be maintained. The MOSFET
cannot deliver the required load current with a 20mV
constant V SD1 . In this case, gate voltage is fully charge-
pumped to V GQP (10.6V nominal).
7. Turn-off V IN1 and turn-on V IN2 and repeat the same tests
listed above. Make sure the ISL6144 is providing gate
voltage, which is modulated based on the load current.
V SD2 is measured between (TP4-TP5), V GS2 is
measured between (TP14-TP21).
17
Two-Feed Parallel Evaluation
Two Feed parallel operation verification can be performed
after completion of the single feed evaluations. Make sure
that the two Input power supplies connected to the
ISL6144EVAL1Z board are identical in voltage value.
Identical input voltages are needed to enable the two feeds
to share the load current (In real world power systems,
current sharing is most likely insured by the power
supplies/modules that have an active current sharing
feature).
1. Turn-on PS1 and PS2 in sequence (hot plugging is not
recommended). Adjust V IN1 and V IN2 close to each
other. Verify the input current of both feeds to be within
acceptable current sharing accuracy (~10%). Current
sharing accuracy will be very poor at light loads and
becomes better with higher load currents.
2. Adjust the load current to different values and verify that
both V SD1 (TP1 to TP2) and V SD2 (TP4 to TP5) are close
to each other. These two voltages might be different
depending on the amount of load current passing through
each of the two feeds.
3. At light loads, I Load * r DS(ON) is less than 20mV, the
ISL6144 operates in the forward regulation mode and
gate voltage is modulated as a function of load current.
When I Load *r DS(ON) becomes higher than the regulated
20mV, the charge pump increases and clamps the gate
voltage to the maximum possible charge pump voltage,
V GQP .
4. Verify the Gate voltage of both MOSFETs V GS1 (TP13 to
TP17) and V GS2 (TP14 to TP21) with different load
currents.
5. Both LED1 and LED2 are off when both feeds are on.
6. For I Load = 4A, turn-off V IN2 and note that V GS2 has
turned off. LED2 is RED and V GS1 has increased from
around 4V to V GQP .
7. Turn V IN2 back on and turn V IN1 off. V GS1 is now off.
LED1 is RED. V GS2 has increased to V GQP .
Performance Tests
Performance tests can be carried out after the two feeds
have been verified and found to be operational in active,
1 + 1 redundancy (when two feeds share the load current,
current sharing is ensured by the incoming power supplies.)
These include gate turn-on at power supply start-up, fast
speed turn-off (in case of fast dropping input rail), slow
speed turn-off (in response to slow dropping input rail) and
fault detection in response to different faults.
Gate Start-Up Test
FIRST-FEED START-UP
When the first feed is turned on, as V IN1 rises, conduction
occurs through the body diode of the MOSFET. This only
occurs for a short time until the MOSFET gate voltage can
be charge-pumped on. This conduction is necessary for
proper operation of the ISL6144. It provides bias for the gate
FN9131.7
October 6, 2011
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| ISL6144IR | 功能描述:IC CTRLR MOSFET HV ORING 20-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:- 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
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| ISL6144IRZA-T | 功能描述:IC CTRLR MOSFET HV ORING 20-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - O 圈控制器 系列:- 标准包装:1,000 系列:- 应用:电池备份，工业/汽车，大电流开关 FET 型:- 输出数:5 内部开关:是 延迟时间 - 开启:100ns 延迟时间 - 关闭:- 电源电压:3 V ~ 5.5 V 电流 - 电源:250µA 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:带卷 (TR) |
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