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參數(shù)資料
| 型號： | LM5067SDX-2 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, DSO10 |
| 封裝： | LLP-10 |
| 文件頁數(shù)： | 5/24頁 |
| 文件大小： | 690K |
| 代理商： | LM5067SDX-2 |
30030933
FIGURE 6. Restart Sequence (LM5067-2)
Under-Voltage Lock-Out (UVLO)
The series pass MOSFET (Q1) is enabled when the input
supply voltage (V
SYS) is within the operating range defined by
the programmable under-voltage lockout (UVLO) and over-
voltage lock-out (OVLO) levels. Typically the UVLO level at
V
SYS is set with a resistor divider (R1-R3) as shown in Figure
1. When V
SYS is less than the UVLO level, the internal 22 A
current sink at UVLO/EN is enabled, the current source at
OVLO is off, and Q1 is held off by the 2.2 mA pull-down cur-
rent at the GATE pin. V
SYS reaches its UVLO level when the
voltage at the UVLO/EN pin reaches 2.5V above VEE. Upon
reaching the UVLO level, the 22 A current sink at the UVLO/
EN pin is switched off, increasing the voltage at the pin, pro-
viding hysteresis for this threshold. With the UVLO/EN pin
above 2.5V, Q1 is switched on by the 52 A current source at
the GATE pin.
See the Applications Section for a procedure to calculate the
values of the threshold setting resistors (R1-R3). The mini-
mum possible UVLO level can be set by connecting the
UVLO/EN pin to VCC. In this case Q1 is enabled when the
operating voltage (VCC – VEE) reaches the POR
EN threshold
(8.4V).
Over-Voltage Lock-Out (OVLO)
The series pass MOSFET (Q1) is enabled when the input
supply voltage (V
SYS) is within the operating range defined by
the programmable under-voltage lockout (UVLO) and over-
voltage lock-out (OVLO) levels. Typically the OVLO level at
V
SYS is set with a resistor divider (R1-R3) as shown in Figure
1. If V
SYS raises the OVLO pin voltage more than 2.5V above
VEE Q1 is switched off by the 2.2 mA pull-down current at the
GATE pin, denying power to the load. When the OVLO pin is
above 2.5V, the internal 22 A current source at OVLO is
switched on, raising the voltage at OVLO and providing
threshold hysteresis. When the voltage at the OVLO pin is
reduced below 2.5V the 22 A current source is switched off,
and Q1 is enabled. See the Applications Section for a proce-
dure to calculate the threshold setting resistor values.
Shutdown/Enable Control
See the Applications Information section for a description of
how to use the UVLO/EN pin and/or the OVLO pin for remote
shutdown and enable control of the LM5067.
Power Good Pin
The Power Good output indicator pin (PGD) is connected to
the drain of an internal N-channel MOSFET. An external pull-
up resistor is required at PGD to an appropriate voltage to
indicate the status to downstream circuitry. The off-state volt-
age at the PGD pin must be more positive than VEE, and can
be up to 80V above VEE with transient capability to 100V.
PGD is switched high at the end of the turn-on sequence when
the voltage from OUT to SENSE (the external MOSFET’s
V
DS) decreases below 1.23V. PGD switches low if the
MOSFET’s V
DS increases past 2.5V, if the system input volt-
age goes below the UVLO threshold or above the OVLO
threshold, or if a fault is detected. The PGD output is high
when the operating voltage (VCC-VEE) is less than 2V.
Application Information
(Refer to Figure 1)
R
IN, CIN
The LM5067 operating voltage is determined by an internal
13V shunt regulator which receives its current from the sys-
tem voltage via R
IN. When the system voltage exceeds 13V,
the LM5067 operating voltage (VCC – VEE) is between VEE
and VEE+13V. The remainder of the system voltage is
dropped across the input resistor R
IN, which must be selected
to pass at least 2 mA into the LM5067 at the minimum system
voltage. The resistor’s power rating must be selected based
on the power dissipation at maximum system voltage, calcu-
lated from:
P
RIN = (VSYS(max) – 13V)
2
/R
IN
CURRENT LIMIT, R
S
The LM5067 monitors the current in the external MOSFET
(Q1) by measuring the voltage across the sense resistor
13
www.national.com
LM5067
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