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Электронный компонент: A1610

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October 2000
alpha microelectronics gmbh
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Description
The
1610, combined with an external NMOS, is
used as a low loss driver for coils, relays or
magnets.
The integrated circuit includes a self protection of
broken wires and short circuits on the input line.
The chip overtemperature protection is adjusted
from 80 to 150 C with an external resistor.
Chip overtemperature and undervoltage errors are
indicated on input IN.
Features
Voltage supply 8 to 45 V DC
5 V reference voltage output
12 V reference voltage output
Quiescent current 1.5 mA
Output peak current up to 100 mA
Undervoltage lockout and power-on reset
Overvoltage protection for the external NMOS
Protection against reversed battery and EMC to
-300 V
Adjustable chip overtemperature protection
Temperature range -40C to +150C
Package SOP 18
1610AT
Die
1610AX






Applications
Driver for coils and relays
Typical Application
Coil driver using
1610
10
11
16
18
12
R
PT
R
REF
18k
30k
IN
1610
IRCR
INPT
GNDD
VDDC
OSC
9
O5V
100n
C
O5V
3
2
17
D
L
M4
V
DD
Output
VDD
OUT
OVP
C
OSC
10n
C
DDC
15
Input
14
GNDA
1
O12V
8
OD
100n
Coil Driver IC
1610
Data Sheet
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Functional Block Diagram
Reference
Regulator 5V
VDD
-
Undervoltage
Lockout
VDD
17
16
2
3
18
12
Frequency
Analyse
OSC
VDDC
OUT
OSC
OVP
Block Diagram
1610
D1
42V
GNDD
M4
O5V
15V
9
Frequency Divider
4:1
GNDA
14
O12V
1
15
IN
OD
8
Turn on / off
Logic
Status
O5V-Undervoltage
Lockout
250k
9V
350k
Error
Logic
Enable
Driver
3V
2,5V
Oscillator
100nF
100nF
C
O5V
C
DDC
1,5nF
14V
Stabilization 12V
Driver
M3
M1
M2
Interference
Suppression
11
10
C
R
PT
R
REF
INPT
IRCR
30k
r
50
50
18k
O5V
Thermal
Shutdown
50A/
25A
50k
V
DD
October 2000
alpha microelectronics gmbh
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Pin Definition
Lead Definition
Pin Symbol Designation
1
O12V
Reference Voltage Output 12 V
2
OVP
Overvoltage Protection Input for external N-Kanal Power MOSFET
3
OUT
Output
8
OD
Output Diode Temperature Sensor
9
O5V
Reference Voltage Output 5 V
10 INPT
Resistor R
PT
for Overtemperature Protection
11 IRCR
Resistor R
REF
for Current Reference
12 OSC
Capacitor C
OSC
for Oscillator Frequency
14
GNDA GND-Analog
15 IN
Input
16 VDDC
Block
Capacitor
17 VDD
Supply
Voltage
18 GNDD
GND-Digital
General function and description
The
1610 combined with an external N-channel power MOSFET serves for the low loss control of
electrical magnetic actuators like relays or magnets and similar kinds of coils. It is especially suitable in
automotive applications.
It is designed for a power supply range from 8 to 45 V.
As protection against reverse polarity of the supply voltage the IC is supplied with an internal dumping
diode D1 in the supply voltage connection (forward voltage approx. 0.6 V).
The chip generates two internally stabilized voltages.
There are a 5 V-voltage source for the digital logic and a 12 V-voltage source for the push-pull drivers.
The chip realizes protection against undervoltage of VDD (VDD-Undervoltage Lockout), undervoltage of
O5V (O5V-Undervoltage Lockout), overvoltage of VDS of the external transistor M4 and against
overtemperature (Thermal Shutdown).
The outputs of the Undervoltages Lockout of VDD and O5V are logical AND combined.

VDD
At start up of the supply voltage the output of VDD-Undervoltage Lockout switches to "High" at about
V
DD
7.6 V.
If the voltage VO5V rises to the switching threshold at 4 V, the "power on reset" of the logic will finish and
the output of the O5V-Undervoltage Lockout goes to "High".
The output of the Error Logic switches to "High" if no overtemperature is detected.
Concurrent the dynamic input will be released and triggers the Enable Driver for the push pull drivers.
The output of the Error Logic switches to "Low", if the supply voltage V
DD
decreases under a value of 7 V.
The Output OUT and the input IN switch to "Low" and the logic enables power on reset.
The undervoltage detection senses the voltage at V
DDC
. With it the integrational effect of the back-up
capacitor C
DDC
is to take into account.
Short-term drops of supply voltage V
DD
below the switching threshold of 7 V do not actuate the
undervoltage detector.
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alpha microelectronics gmbh
October 2000
VDDC
At this pin a forward voltage of the dumping diode D1 reduces the supply voltage V
DD
.
This pin must be connected to a back-up capacitor.
It is allowed to connect the power supply directly to the pin VDDC.
In this case the protection against EMC and against reverse polarity of the supply voltage is cancelled.
The threshold value for the detecting of the undervoltage decreases by a forward voltage.

O5V
The reference regulator 5 V must wired-up to a back-up capacitor.
The output may be loaded with 5 mA maximally. If the output O5V is reloaded more than 1.5 mA
deviations are permitted data.

O12V
The 12 V-voltage source is a source follower stage M1 with R
DS(on)M1
of about 60
.
From V
DD
= 0 to 14 V the output voltage shows a linear dependence on the supply voltage.
The output may be loaded with 10 mA maximally.
Besides you must keep the dependence of load for the voltage. If the output O12V is reloaded deviations
are permitted data.

OUT
The closing resistors R
DS(on)
of the push-pull driver transistors M2 and M3 are about
45
respectively 20
. The push-pull driver transistors can drive at T
a
= 25 C reloading currents of
about 100 mA. Without load the maximal output voltage of the push-pull driver is identical with the
voltage V
O12V
.
The output is internal protected with a 15 V - Zener diode against external overvoltage.
The resistive load must not exceed 10 mA.
The current limititation of the external transistor M4, e.g. against short-circuit, must be external guarded.

OVP
The input OVP is internal connected by a 42 V - Zener diode and three forward diodes to the output OUT.
With that it is possible to protect the external transistors M4 in the switched off condition against excess
voltages by clamping the drain of this transistor to typically (44 V + V
GSM4
).
The threshold for the protection against overvoltage is reached if a current > 70 A flows in the input OVP.
In result the internal Low side driver transistor M3 switches off. After that the current loads the gate of the
external transistor to V
GSM4
and switches it on.
At use of external transistors with a higher breakdown voltage the overvoltage protection can be modified
by an external Zener diode.
The function overvoltage protection is dimensioning at inductive loads. With the driving other loads limit
the current in the Pin OVP if necessary.

IN
Input voltages > 4 V are logical high and input voltages < 2,0 V are logical Low.
If the input is open (non-connected) the internal value is recognized as logical high.
An internal RC filter with a delay time of 700 ns inhibits short disturbing pulses.
The input IN is Low active.
The internal Turn on/ off Logic separates the functions of the input:
1. Dynamic switching on
The dynamic switching on condition is derived from the oscillator frequency.
In the case the input signal (rectangle, sinus, triangle) should meet the following frequency condition the
output of the Turn on/off Logic is set to High:
Dynamic switching on condition: f
IN_ON
> 0.6*f
OSC
The turning-on delay time is a multiple of the oscillator frequency T
POSC
. It has no fixed value but it
depends on the phase position and is between 2*T
POSC
and 6*T
POSC
.
The dimension has to set to 6*T
POSC
(worst case).
October 2000
alpha microelectronics gmbh
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2. Dynamic switching off
The dynamic turning-off condition is derived from the oscillator frequency.
In the case the input signal should meet the following frequency condition the output of the Turn on/off
Logic is set to Low:
Dynamic switching off condition: f
IN_OFF
< 0.2* f
OSC
The turning-off delay time is a multiple of the oscillator frequency T
POSC
. It has no fixed value but it
depends on the phase position and is between 2*T
POSC
and 6*T
POSC
.
The dimension has to set to 6*T
POSC
(worst case).
3. Static switching off
Following three static conditions at the input switch off the output OUT:
Static switching off conditions: - V
IN_OFF
> 4 V "High"
-
V
IN_OFF
< 2 V "Low"
- Input open
There is no turning off delay time in case of switching off with static High, cable interrupt (input open) and
short circuit to VDD
The turning off delay time is a multiple of the period of the oscillator frequency in case of switching off with
static Low or short-circuit to GND.
It has no fixed value but it depends on the phase position and is between 2*T
POSC
and 6*T
POSC
.
The dimension has to set to 6*T
POSC
(worst case).
4. External PWM control of OUT
After fulfilment the turning-on condition and the turn-on delay time a Low - level of the external PWM -
signal at the input corresponds to a High - level of the PWM - signal at OUT.
5. Low-Indication of state
The input indicates the state in case of detecting undervoltage at VDD, undervoltage at O5V or
overtemperature.
During this errors the input is with low-resistance clamped to a low signal (approx. 1 V). In this state the
input current has to be external limited to maximum 30 mA.
During the active indication of state the supply current increases to about 5 mA.

OSC
The current source at the oscillator input delivers for the external capacitor C
OSC
a reload current
of 50 A respective -50 A.
Resulting a triangle voltage on the pin OSC is produced. The lower switching threshold of the oscillator is
about 0.8 V; the upper threshold is about 4 V. The oscillator frequency is dependent on the technological
tolerance of the voltage V
O5V
.
The triangle voltage is internal transformed into a square-wave voltage.
Through frequency division by 4:1 an internal frequency of f
OSC
is realized for the analysis of the
external PWM signal.
The operational frequency range of
1610 is between 50 - 5 000 Hz.

The external capacitor may be dimension approximately by
C
OSC
[nF] = 7070 / f
OSC
[Hz]