HI-SINCERITY
MICROELECTRONICS CORP.
•
Protection Diode
Spec. No. : Preliminary Data
Issued Date : 1998.07.01
Revised Date : 1999.08.01
Page No. : 4/5
(The figure is shown as Regulator with Reverse Diode Protection in advanced applications)
In general operation, H1084E does not need any protection diodes. From the cross-section structure of
H1084E, the output pin is connected to P+ substrate, and the input pin is connected to N- well. There is a
parasitic reverse diode between them. It can handle microsecond surge currents of 50A to 100A. Even with large
output capacitance, it is very difficult to get those values of surge currents in normal operation. Only with high
value output capacitors, such as 1000uF. And with the input pin instantaneously shorted to ground. can damage
occur. A crowbar circuit at the input of the H1084E can generate those kinds of currents, and a diode from output
to input is recommended. Normal power supply cycling or even plugging and unplugging in the system will not
generate currents large enough to do any damage.
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Advanced Applications
H 1084E
Vin=7V
1K
2K
10uF
GND
10uF
GND
10uF
Vin
H 1084E
*20m ohm
GND
Vo
Vo=1.5~3.45
H 1084E
*20m ohm
GND
10uF
10uF
GND
GND
GND
Paralleling Regulators
Adjustable Output Voltage
*20m ohm is ballast resistance..
The inter - connection of #18 wire could act as ballast resistance.
H 1084E
V
in
1K
V
O
Vin
H 1084E
Vo
10uF
10uF
Zener Diode
or Voltage Reference
GND
10uF
10uF
GND
GND
100uF
GND
GND
GND
*Vo = Vref ( 1+R2/R1 ) + Iadj x R2
**Optional for improved ripple rejection.
*Please refer to "protection diode section" for detailed description.
Regulator with Reference
Regulator with Reverse Diode Protection
HSMC Product Specification
HSMC [ HI-SINCERITY MOCROELECTRONICS ]
