The VND05B, VND05B (011Y), VND05B (012Y) is
amonolithicdevicedesignedin
STMicroelectronics VIPower technology, intended
for driving resistive or inductive loads with one
side connected to ground. This device has two
channels, and a common diagnostic. Built-in
thermalshutdownprotectsthechipfrom
overtemperature and short circuit. The status
output provides an indication of open load in on
state, open load in off state, overtemperature
conditions and stuck-on to VCC.
(*) In=Nominal current according to ISO definition for high side automotive switch (see note 1)
(^) Seeswitching time waveform
(•)TheV
exceed 10 mA at the input pin.
Note 1: The Nominal Current is the current at T
Note 2: I
Note 3: t
Low output voltage status I
=1.6mA0.4V
STAT
Undervoltage shut-down3.54.56V
Status clamp voltageI
Thermal shut-down
temperature
STAT
I
STAT
= 10mA
= -10mA
56
-0.7
140160180°C
Thermal shutdown
hysteresis temperature
Reset temperature125°C
R
7V
50°C
Open voltage levelOff state (note 2)2.545V
Open load current levelOn state5180mA
Overtemperature Status
delay
(note 3)510µs
Open Load Status delay(note 3)505002500µs
is internally clamped at 6V about. It is possible to connect this pin to an higher voltage via an external resistor calculated to not
IH
=85°C for battery voltage of 13V which produces a voltage drop of 0.5V
c
OL(off)
povltpol
=(VCC-VOL)/R
: ISO definition
OL
V
Note 2 Relevant FigureNote 3 Relevant Figure
4/11
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Page 5
Switching Time Waveforms
VND05B / VND05B (011Y) / VND05B (012Y)
FUNCTIONAL DESCRIPTION
The device has a common diagnostic output for
both channels which indicates open load in onstate, open load in off-state, overtemperature
conditions and stuck-on to VCC.
From the falling edgeof the input signal, the status
output, initially low to signal a fault condition
(overtemperature or open load on-state), will go
back to ahighstate with a different delay in case of
overtemperature (t
(t
)respectively.Thisfeatureallowsto
pol
) and in case of open load
povl
discriminate the nature of the detected fault. To
protect the device against short-circuit and
overcurrent condition, the thermal protection turns
the integrated PowerMOS off at a minimum
junctiontemperature of140°C.When this
temperature returns to 125°C the switch is
automatically turned in again. In short-circuit the
protection reactswith virtually no delay, the sensor
(one for each channel) being located inside each
of the two PowerMOS areas. This positioning
allows the device to operate with one channel in
automatic thermal cycling and the other one on a
normal load. An internal function of the devices
ensures the fast demagnetization of inductive
loads with a typical voltage (V
) of -18V. This
demag
function allows to greatly reduce the power
dissipation according to the formula:
P
dem
= 0.5•L
load
•(I
load
)
2
•[(V
CC+Vdemag
)/V
demag
]•f
where f= switching frequency and
V
= demagnetization voltage.
demag
The maximum inductance which causes the chip
temperature to reach the shutdown temperature in
a specified thermal environment is a function of
the load current for a fixed VCC,V
demag
and f
according to the above formula. In this device if the
GND pin is disconnected, with VCCnot exceeding
16V, both channels will switch off.
PROTECTINGTHEDEVICEAGAINST
REVERSE BATTERY
The simplest way to protect the device against a
continuous reverse battery voltage (-26V) is to
insert a Schottky diode between pin 2 (GND) and
ground, as shown in the typical application circuit
(fig. 2).
The consequences of the voltage drop across this
diode are as follows:
- If the input is pulled to power GND, a negative
voltage of -Vfis seen by the device. (Vil,V
thresholds and V
are increased by Vfwith
STAT
respect to power GND).
- The undervoltage shutdown level isincreased by
Vf.
If there is no need for the control unit to handle
external analog signals referred to the power
GND, the best approach is to connect the
reference potential of the control unit to the device
ground (see application circuit in fig. 3), which
becomes the common signal GND for the whole
control board avoiding shift on Vil,Vihand V
STAT
This solution allows the use of a standard diode.
ih
.
5/11
Page 6
VND05B / VND05B (011Y) / VND05B (012Y)
THRUTH TABLE
INPUT 1INPUT 2OUTPUT 1OUTPUT 2DIAGNOSTIC
L
Normal operation
UndervoltageXXLLH
Thermal shutdown
Openload
Output shorted to V
Channel 1HXLXL
Channel 2XHXLL
Channel 1
Channel 2
Channel 1
CC
Channel 2
H
L
H
H
L
X
L
H
L
X
L
Figure: 1: Waveforms
L
H
H
L
X
L
H
L
X
L
H
L
L
H
L
H
H
L
X
L
H
H
X
L
L
H
H
L
X
L
H
L
X
L
H
H
H
H
H
H
L
L
L
L
L
L
L
L
6/11
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Page 7
VND05B / VND05B (011Y) / VND05B (012Y)
Figure 2: Typical application circuit with a Schottky diode for reverse supply protection
Figure 3: Typical application circuit with separate signal ground
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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The ST logo is a trademark of STMicroelectronics
1999 STMicroelectronics - Printed in ITALY- All Rights Reserved.
STMicroelectronics GROUP OF COMPANIES
http://www.st.com
11/11
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