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TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA7612AP
LED Driver
The TA7612AP is designed for 10 LED level meter driver.
Features
· 10 LED's bar display driver.
· Linear scale display.
· Continuous 10 LED display.
· By choosing a series connection of IC, can display more than
10 LED.
Block Diagram
(Note 1)
Weight: 1.00 g (typ.)
TA7612AP
Note 1: (V
Terminated ground
Terminated 1 kΩ between ground
max ( = PIN 15) = 3.6 V)
ref
2 Pin Connection Display Condition
Light on No.1 LED VIN = 0~0.4 V (typ.)
Lighted all LED V
Without lighted No.1 LED VIN = 0~0.36 V (typ.)
Light on No.1 LED V
≥ 3.6 V (typ.)
IN
≥ 0.36 V (typ.)
IN
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PD Calculation At 10 LEDs
TA7612AP
PD = VCC × I
Note: V
is: VOL = VCC − VF (LED) − RL × IO (When each output is “ON”.)
OL
+ VOL × IO × 10 (W)
CC1
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Functional Description
Block diagram
The above simplified TA7612AP Block Diagram is to give the general idea of the circuit's operation.
(1) General operation
If V
Voltage greater than the first threshold but less than the second threshold is applied “No.1”
IN
LED is lighted, if the input voltage is between the second and the third threshold, then 'No.1 and
No.2' LED are in operation and so on.
(2) Adding R
These resistors are to give the reference voltage of 10 comparators.
And then above V
R
and R2 will be calculated as follows.
1
and R2 operation
1
− V
is to give the Input Voltage sensitivity of this device.
B
A
TA7612AP
How to adjust the dimmer
Toshiba recommends that the value of the resistor at pin 8 be set to 10 kΩ (up to 100 kΩ).
If the value of the resistor is set lower, the current that flows through each V
will increase. Thus, when setting the value of the resistor, care must be taken with the relationship between the
power dissipation
(max) and the current that is required to drive LEDs.
3
and the power dissipation
O1~10
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TA7612AP
Maximum Ratings
Characteristics Symbol Rating Unit
Supply voltage VCC 20 V
Power dissipation (Note 2) PD 750 mW
Operating temperature T
Storage temperature T
(Ta = 25°C)
−30~75 °C
opr
−55~125 °C
stg
Note 2: Derated above Ta = 25°C in the proportion of 6 mW/°C.
Electrical Characteristics
Characteristics Symbol
Supply voltage VCC ― ― 6 12 15 V
Supply current (1) I
Supply current (2) I
Input bias current R
Internal resistance IIN ― VIN = GND ― −0.25 −1 µA
Input voltage range VIN ― ― 0 ― 8 V
Output offset voltage V
Output voltage (high level) VOH ―
Output voltage (low level) VOL ―
Output current IO ― V
Leak current IIL ―
(Ta = 25°C, VCC = 12 V)
Test
Circuit
― V
CC1
―
CC2
― ― 7 9 11 kΩ
TOT
― V
OFF
= 4 V, VIN = 0 V ― 15 20 mA
ref
= 4 V, VIN = 4.1 V
V
ref
I
= 10 mA × 10
O
= 4 V −40 ― 40 mV
ref
= 4 V, VIN = GND
V
ref
R
=1.5 kΩ
L
= 4 V, VIN = 4.10 V
V
ref
R
= 1.5 kΩ
L
= 4 V, VIN = 4.10 V ― 7 12 mA
ref
= 4 V
V
IN
V
ref Max
Test Condition Min Typ. Max Unit
― 150 160 mA
11.9 11.93 ― V
― 0.6 1.0 V
= 0 V, V
ref Min
= 0 V
― ― 15 µA
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Application Circuit
10 LEDs applications
20 LEDs applications
TA7612AP
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Package Dimensions
TA7612AP
Weight: 1.00 g (typ.)
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TA7612AP
A
RESTRICTIONS ON PRODUCT USE
· TOSHIBA is continually working to improve the quality and reliability of its products. Nevertheless, semiconductor
devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical
stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to comply with the standards of
safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of
such TOSHIBA products could cause loss of human life, bodily injury or damage to property.
In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as
set forth in the most recent TOSHIBA products specifications. Also, please keep in mind the precautions and
conditions set forth in the “Handling Guide for Semiconductor Devices,” or “TOSHIBA Semiconductor Reliability
Handbook” etc..
· The TOSHIBA products listed in this document are intended for usage in general electronics applications
(computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances,
etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires
extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or
bodily injury (“Unintended Usage”). Unintended Usage include atomic energy control instruments, airplane or
spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments,
medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this
document shall be made at the customer’s own risk.
· The products described in this document are subject to the foreign exchange and foreign trade laws.
· The information contained herein is presented only as a guide for the applications of our products. No
responsibility is assumed by TOSHIBA CORPORATION for any infringements of intellectual property or other
rights of the third parties which may result from its use. No license is granted by implication or otherwise under
any intellectual property or other rights of TOSHIBA CORPORATION or others.
000707EB
· The information contained herein is subject to change without notice.
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This datasheet has been download from:
www.datasheetcatalog.com
Datasheets for electronics components.
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