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LM2825 Datasheet(PDF) 11 Page - Texas Instruments

Part # LM2825
Description  Integrated Power Supply 1A DC-DC Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM2825 Datasheet(HTML) 11 Page - Texas Instruments

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LM2825
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SNVS127C – MAY 1997 – REVISED APRIL 2013
LOWERING OUTPUT RIPPLE
When using the adjustable parts, one can achieve lower output ripple voltage by shorting a resistor internal to the
LM2825. However, if this resistor is shorted, a feed forward capacitor must be used to keep the regulator stable.
For this reason, this resistor must be left open on all of the fixed output voltage versions or instability will result.
See the FEED FORWARD CAPACITOR SELECTION (CFF) selection below. Shorting the internal resistor is
accomplished by shorting pins 8 and 9 on the LM2825, and will typically reduce output ripple by 25 to 33%.
FEED FORWARD CAPACITOR SELECTION (CFF)
When using an adjustable part and pins 8 and 9 are shorted to reduce output ripple, a feed forward capacitor is
required. This capacitor is typically between 680 pF and 2700 pF. Table 1 shows the value for CFF for a given
output voltage and feedback resistor R2 (R1 = 1 kΩ).
Table 1. CFF Selection Table
VOUT
R2
CFF
LM2825-ADJ
2
630
N/A
3
1.43k
N/A
4
2.26k
2700 pF
5
3.09k
2700 pF
6
3.92k
2200 pF
7
4.75k
1800 pF
8
5.49k
1500 pF
LM2825H-ADJ
7
4.75k
2700 pF
8
5.49k
2200 pF
9
6.34k
1800 pF
10
7.15k
1500 pF
11
8.06k
1000 pF
12
8.87k
820 pF
13
9.53k
680 pF
14
10.5k
680 pF
15
11.3k
680 pF
SHUTDOWN
The circuit shown in Figure 24 shows 2 circuits for the Shutdown/Soft-start feature using different logic signals for
shutdown and using a 0.1
μF Soft-start capacitor.
THERMAL CONSIDERATIONS
The LM2825 is available in a 24-pin through hole PDIP. The package is molded plastic with a copper lead frame.
When the package is soldered to the PC board, the copper and the board are the heat sink for the LM2825.
Copyright © 1997–2013, Texas Instruments Incorporated
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