UAF1780 ,DUAL 2A LOW DROP OUT INTELLIGENT POWER SWITCHCO SGS-THOMSON
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UAF1780-1781-1782
DUAL 2 A LOW DROP OUT INTELLIGENT P ..
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UAF1780
DUAL 2A LOW DROP OUT INTELLIGENT POWER SWITCH
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Nf iWClR(l5)Ell:,,E(C)htii'iC(hl%)ie) UAF1780-1781-1782
DUAL 2 A LOW DROP OUT INTELLIGENT POWER SWITCH
ADVANCE DATA
" LOW POWER DISSIPATION (LOW VSAT 20.6 V F W
© 2 A) MULTIWATT-15
n ALL INPUTS ARE OPERATIONAL WITH
CONTROL SIGNALS HIGHER THAN Vcc
is ALL INPUTS WITHSTAND VOLTAGES LOWER
THAN GROUND
" HIGH OUTPUT CURRENTS
n PROTECTION OF OUTPUT TRANSISTORS
(UP TO + 32 V)
II THE OUTPUTS CAN WITHSTAND VOLTAGES
LOWER THAN GROUND
n WITHSTAND ON Vcc SPIKES UP TO (60 V, ORDER CODES:
10 ms) UAF17808P
n DIFFERENTIAL INPUTS UAF1782SP
UAF1780HSP
UAF1782HSP
DlP-16/2
DESCRIPTION
The UAF1780-1781-1782 are dual interface circuits
delivering high output currents and capable of dri-
ving any type of load.
An on-chip dc/dc conversion unit in conjuction with
a few low-cost external components (a low value in-
ductor and a low voltage capacitor) are implemen-
ted to limit the saturation voltage thereby optimizing
the efficiency.
The devices are particularly well protected against
destructive overloads. Each output implements a
current limit circuitry, a desaturation monitoring unit
ORDER CODE ".
UAF178ODP-1781DP
for the detection of overloads and short-circuits, and PIN CONNECTIONS
a thermal protection feature.
Corresponding output is turned off in case of prolon- I t 1 1 Nd, 16 j
ged desaturation or excessive internal dissipation. npu Delay 1
This condition is reflected by a low level on ALARM iaa C 2 15 Cl Output 1
output terminal. This protection unit can be reacti- St obe 3 14
vated by applying a logic low signal to RESET input. ' C Cl Alarm 1
However, for inductive loads, a delay is imposed on Ground C 4 13 5 Vcc
signal applied to this RESET input so as to prevent Current limit C ti 12 3 Reference
a rapid and premature conduction of output transis- adjust
tors. Oscillator C 6 11 3 Alarm 2
A logic high signal applied to STROBE input will di- vm, c 7 10D Output 2
sable both power outputs. Input 2 8 g p Delay 2
The devices operates within a supply voltage range
of+8VtO+32V. L J
September 1988 1/6
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
UAF1780-1781-1782
PIN CONNECTIONS
( C) w 1 Oscillator 9 -vcc
2 -V(aux) 10 -Output 1
3-lnput 2 11 -Alarm 1
4-Delay 2 12-Delay 1
5 -Alarm 2 13 -|ngut1
I l l 6-Reference 14-Reset
a 10 12 14 7-Output 2 15-Strobe
2 6 8 -Ground
1 3 5 7 9 11 13 15
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
Vcc (*) Supply Voltage + 35 V
v.1 input Voltages 30 to + 55 V
Vreset
Vstrobe .
lo Output Current Internally Limited A
l Current In DC/DC Converter Inductance 0.4 A
Pun Total Power Dissipation Internally Limited W
Toper Operating Free-air Temperature Range - 40 to + 85 °C
T, Junction Temperature + 150 °C
. + 60 V (10 ms)
THERMAL DATA
Rth(j-c) Maximum Junction-case Thermal Resistance DIP.16 l 25 °C/W
Multiwatt 2.5
Ruui-a) Maximum Junction-ambient Thermal DIP.16 7O °C/W
Resistance Multiwatt 40
CFi" SGS-THOMSON
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