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參數(shù)資料
| 型號(hào)： | L6370L |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 2.5A HIGH-SIDE DRIVER INDUSTRIAL INTELLIGENT POWER SWITCH |
| 中文描述： | 包2.5a高邊驅(qū)動(dòng)器工業(yè)智能功率開(kāi)關(guān) |
| 文件頁(yè)數(shù)： | 6/10頁(yè) |
| 文件大?。?/td> | 93K |
| 代理商： | L6370L |
INPUT SECTION
The input section is an high impedance differen-
tial stage with high common and differentialmode
range. There’s built-in offset of +1.4V (typical
value) and an hysteresis of 400mV (maximum
value), to ensure high noise immunity.
DIAGNOSTIC LOGIC
The operatingconditions of the device are perma-
nently monitored and the following occurences
are signalled via the DIAG1/DIAG2 open-drain
output pins:
-Short Circuit versus ground.
A current limiting circuit fixes at Isc = 3.2A
(typical value) the maximum current that can
be sourced from the OUTPUT pin (for more
detailssee shortcircuit operation section).
- Short CircuitversusVs.
- Under Voltage(UV)
- Over Temperature(OVT)
- Open Load, if the output current is less than
3mA(typical value).
- Output DMOS Open
accordingto the diagnosticTruth Table:
SHORT CIRCUIT OPERATION
in order to minimise the power dissipation when
the output is shorted to grounded, an innovative,
non dissipative short cicuit protection (patent
pending) is implemented, avoiding, thus the inter-
vention of thethermal protectionin most cases.
Whenever the output is shorted to ground, or,
generally speaking, an over current is sinked by
the load, the output devices is driven in linear
mode, sourcing the Isc current (typically 3.2A) for
a time interval (t
on
) defined by means of the exter-
nal C
ON
capacitor connected between the ON-
DELAY pin and GND. Whether the short circuit
crease within the t
on
interval the DIAG2 output
status is not affected, acting as a Programmable
Diagnostic Delay.
This function allow the device to drive a capaci-
tive load or a filament lamp (that exhibits a very
low resistance during the initial heading phase)
without the intervention of the diagnostic.
If the short circuit lasts for the whole t
ON
interval,
the output DMOS is switched OFF and the DIAG2
goes low, for a time interval t
OFF
lasting 64 times
t
ON
.
At the end of the t
OFF
interval if the short circuit
condition is still present, the output DMOS is
turned ON (and the DIAG2 goes high - see fig4)
for another t
ON
interval and the sequence starts
again, or, whether not, the normal condition op-
erationis resumed.
The t
ON
interval can be set to lasts between 64
μ
s
and 2.56ms for a C
ON
capacitorvalue ranging be-
tween 50pF and 2nF to have:
t
ON
(
μ
s) = 1.28 C
ON
(pF)
If the ON-DELAYpin is groundedthe non dissipa-
tive short circuit protection is disabled, and the Isc
current is delivered until the Overtemperature
Protection shuts the device off. The behaviour of
the DIAG2 output is, in this situation, showed in
the DiagnosticTruthTable.
OVERTEMPERATURE PROTECTION (OVT)
If the chip temperature exceeds
Θ
lim
(measuredin
a central position in the chip) the chip deactivates
itself.
The following actions are taken:
all the output stage is switched off;
the signal DIAG2 is activated (active low).
Normal operation is resumed as soon as (typically
after some seconds) the chip temperature moni-
tored goes back below
Θ
lim
-
Θ
H
.
The different thresholds with hysteretic behavior
assure that no intermittent conditionscan be gen-
erated.
UNDERVOLTAGE PROTECTION (UV)
The supply voltage is expected to range from
9.5V to 35V, even if its referencevalue is consid-
ered to be 24V.
In thisrange the device operates correctly.
Below 9.5V the overall system has to be consid-
ered not reliable.
Protection will thus shut off the output whenever
the supply voltage falls below the mask fixed by
the V
sth1
(9V typ.)and V
sth2
(8.5Vtyp.).
The hysteresis (see fig. 2) ensuresa non intermit-
tent behavior at low supply voltage with a super-
imposed ripple.
The Under Voltage status is signalled via the
DIAG1 and DIAG2 outputs (see the Diagnostic
TruthTable) .
DEMAGNETIZATION OF INDUCTIVE LOADS
An internal zener diode, limiting the voltage
across the Power MOS to between 50 and 60V
(V
cl
), provides safe and fast demagnetization of
inductiveloads without externalclamping devices.
The maximum energy that can be absorbed from
an inductive load is specified as 1J (at Tj = 85
°
C)
(see figure 2)
L6370
6/10
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| L6370Q | 功能描述:電源開(kāi)關(guān) IC - 配電 2.5A Single H-Side 9.5V - 35V SP Switch RoHS:否 制造商:Exar 輸出端數(shù)量:1 開(kāi)啟電阻（最大值）:85 mOhms 開(kāi)啟時(shí)間（最大值）:400 us 關(guān)閉時(shí)間（最大值）:20 us 工作電源電壓:3.2 V to 6.5 V 電源電流（最大值）: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-5 |
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