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PDF VRG8692 Datasheet ( Hoja de datos )

Número de pieza VRG8692
Descripción Adjustable 7.5A Positive LDO Regulator
Fabricantes Aeroflex Circuit Technology 
Logotipo Aeroflex Circuit Technology Logotipo

Total 10 Páginas
		
VRG8692 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

1 page

VRG8692 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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