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TA76432FR Datasheet(PDF) 5 Page - Toshiba Semiconductor

No. de Pieza. TA76432FR
Descripción  1.26-V Adjustable High-Precision Shunt Regulators
Descarga  13 Pages
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Fabricante  TOSHIBA [Toshiba Semiconductor]
Página de inicio  http://www.semicon.toshiba.co.jp/eng
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TA76432FR Datasheet(HTML) 5 Page - Toshiba Semiconductor

 
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TA76432FT/FC/F/FR/S
2006-11-06
5
Electrical Characteristics
(Unless otherwise specified, Ta
= 25°C, IK = 5 mA)
Characteristics
Symbol
Test Condition
Min
Typ.
Max
Unit
Reference voltage
VREF
VKA = VREF
1.242
1.26
1.278
V
Deviation of reference input voltage
over temperature
VREF (dev)
0°C <= Ta <= 85°C, VKA = VREF
3
15
mV
VREF <= VKA <= 5 V
0.5
2.5
Ratio of change in reference input
voltage to the change in cathode
voltage
ΔVREF/ΔV
5 V <= VKA <= 19 V
0.3
2.0
mV/V
Reference input current
IREF
VKA = VREF
2
4
μA
Deviation of reference input current
over temperature
IREF (dev)
0°C <= Ta <= 85°C, VKA = VREF,
R1 = 10 kΩ, R2 = ∞
0.3
1.2
μA
Minimum cathode current for
regulation
IKmin
VKA = VREF
0.2
0.5
mA
Off-State cathode current
IKoff
VKA = 19 V, VREF = 0 V
1.0
μA
Dynamic impedance
⎪ZKA
VKA = VREF, f <= 1 kHz,
0.5 mA <= IK <= 15 mA
0.2
0.5
Ω
The deviation parameters VREF (dev) and IREF (dev) are defined as the maximum variation of the VREF and IREF over the
rated temperature range.
The average temperature coefficient of the VREF is defined as:
Application Circuit Example
Error amplification circuit for the switching power supply
This circuit amplifies the difference between the switching power supply’s secondary output voltage and the shunt
regulator’s reference voltage. It then feeds the amplified voltage back to the primary input voltage via the
photocoupler.
()
C
ppm
Ta
C
@25
V
10
V
V
REF
6
(dev)
REF
REF
°
Δ
⎟⎟
⎜⎜
°
×
=
α
min
max
VREF (dev)
ΔTa
VREF
Photo-
coupler
VOUT
GND
Shunt regulator


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