ta76432af TOSHIBA Semiconductor CORPORATION, ta76432af Datasheet - Page 4

• Manufacturer Part Number: ta76432af
• Description: 1.26-v Adjustable High-precision Shunt Regulators
• Manufacturer: TOSHIBA Semiconductor CORPORATION

Recommended Operating Conditions
Electrical Characteristics
(Unless otherwise specified, Ta = 25°C, I
The deviation parameters V
rated temperature range.
The average temperature coefficient of the V
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.
Application Circuit Example
Cathode voltage
Cathode current
Operating temperature
Reference voltage
Deviation of reference input voltage
over temperature
Ratio of change in reference input
voltage to the change in cathode
voltage
Reference input current
Deviation of reference input current
over temperature
Minimum cathode current for
regulation
Off-state cathode current
Dynamic impedance
Error amplification circuit for switching power supply
V
REF
max
min
Characteristics
Characteristics
ΔTa
Photo-
coupler
REF (dev)
and I
Shunt regulator
V
ΔV
I
V
REF (dev)
Symbol
Symbol
REF (dev)
REF (dev)
⎪Z
REF (dev)
V
I
REF
I
T
V
Kmin
I
REF
Koff
REF
I
opr
KA
KA
K
REF
/ΔV
⎪
V
GND
are defined as the maximum variation of the V
is defined as:
OUT
K
V
0°C < = Ta < = 85°C, V
V
5 V < = V
V
0°C < = Ta < = 85°C, V
R
V
V
V
0.5 mA < = I
KA
REF
KA
KA
KA
KA
1
= 5 mA)
= 10 kΩ, R
= V
= V
= V
= 19 V, V
= V
V
Min
−40
< = V
0.5
REF
KA
4
REF
REF
REF
REF
KA
α
K
< = 19 V
V
, f < = 1 kHz,
< = 15 mA
Test Condition
REF
< = 5 V
2
REF
= ∞
=
= 0 V
KA
KA
⎛
⎜
⎜ ⎜
⎝
V
= V
= V
REF
V
Typ.
⎯
⎯
⎯
REF
REF
REF
(dev)
Δ
@25
,
Ta
TA76432AFT/AF/AFR/AS
×
10
°
C
6
⎞
⎟
⎟ ⎟
⎠
Max
19
15
85
(
1.247
ppm
Min
⎯
⎯
⎯
⎯
⎯
⎯
⎯
⎯
°
C
)
Typ.
1.26
0.5
0.3
0.3
0.2
0.2
REF
⎯
3
2
Unit
mA
°C
and I
V
2006-11-07
1.273
Max
2.5
2.0
1.2
0.5
1.0
0.5
15
4
REF
over the
mV/V
Unit
mV
mA
μA
μA
μA
Ω
V