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PDF VRG8691 Data sheet ( Hoja de datos )

Número de pieza VRG8691
Descripción Adjustable 7.5A Positive LDO Regulator
Fabricantes Aeroflex Circuit Technology 
Logotipo Aeroflex Circuit Technology Logotipo



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No Preview Available ! VRG8691 Hoja de datos, Descripción, Manual

Standard Products
VRG8691/92
Adjustable 7.5A Positive LDO Regulator
Radiation Tolerant
www.aeroflex.com/voltreg
November 12, 2013
FEATURES
Radiation performance
- Total dose: 100 krads(Si),
Dose rate = 50 - 300 rads(Si)/s
Output voltage adjustable: 1.0V to 3.3V
Output current: 7.5A
Dropout voltage: 0.5V at 7.5Amps
Voltage reference: 1.0V ±0.5%
Load regulation: 0.5% max
Line regulation: 0.2% max
Ripple rejection: >80dB
Enable Input - TTL / CMOS Compatible
Slow Start capability
Stable with multiple ceramic output capacitors
Packaging – Hermetic metal
- Thru-hole or Surface mount
- 12 Leads, 0.900"L x 1.000"W x .205"Ht
- Power package
- Weight - 18 gm max
Designed for aerospace and high reliability space
applications
Aeroflex Plainview’s Radiation Hardness Assurance Plan is DLA Certified to MIL-PRF-38534, Appendix G.
DESCRIPTION
The Aeroflex Plainview VRG8691/92 is capable of supplying in excess of 7.5Amps over the output voltage range as
defined under recommended operating conditions. The regulator is exceptionally easy to set-up, requiring only 2
external resistors to set the output voltage. The module design has been optimized for excellent regulation and low
drop-out voltage. Figures 2 through 5 illustrate setting output voltage, setting current limits and choosing a slow start
capacitor. The VRG8691/92 serves a wide variety of applications including local on-card regulation, programmable
output voltage regulation or precision current regulation.
The VRG8691/92 has been specifically designed to meet exposure to radiation environments. The VRG8691 is
configured for a Thru-Hole 12 lead metal power package and the VRG8692 is configured for a Surface Mount 12 lead
metal power package. It is guaranteed operational from -55°C to +125°C. Available screened to MIL-STD-883, the
VRG8691/92 is ideal for demanding military and space applications.
CURRENT LIMIT (ICL)
The VRG8691/92 features internal current limiting making them virtually blowout-proof against overloads. The limit
is nominally 11.5A @ Vin = 5V (see Table 2), but may be increased or decreased with the addition of one external
resistor (see Application Note 2).
1
VIN 2
3
VBIAS 4
ENABLE
GND
5
6
VRG8691/92
12
11 VOUT
10
9 VSENSE
8 Current Limit
7 Slow Start
SCD8691 Rev H
FIGURE 1 – BLOCK DIAGRAM / SCHEMATIC

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VRG8691 pdf
APPLICATION NOTE 2 (CONTINUED)
SETTING THE CURRENT LIMIT
To Decrease the Current Limit (ICL):
VBIAS
0.1µF
4
VIN
R DEC
CURR. LIMIT
ENABLE
1µF + 47µF
CER TANT
1
2
3
8
5
VBIAS
VRG8691/92
10
VIN VOUT 11
12
CURR. LIMIT
ENABLE
GND
6
SLOW START 7
0.1µF
VSENSE
9
IADJ
VREF (=1V)
1µF
R1 CER
R2
VOUT
+
CLOAD
47µF
TANT
- As shown in Table 3, if the ’CURR. LIMIT’ function (pin 8) is left open, the ICL decreases from 11.5 A(NOM) as VIN is
decreased from 5V.
- To achieve any ICL, less than nominal, use RDEC which can be calculated using the following formula:
( )RDEC(K-OHMS) =
31 x VIN
69 x VIN
30
- ICL
FIGURE 4 – DECREASING THE CURRENT LIMIT (ICL)
SCD8691 Rev H 11/12/13
5
Aeroflex Plainview

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