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L6932H1.2TR

P1-P3P4-P6P7-P9P10-P12P13-P13
L6932H1.2 Application information
7/13
6 Application information
6.1 Application circuit
Figure 7. Demoboard application circuit
6.2 Demoboard layout
Figure 8. Demoboard layout
L6932H1.2
R1
R2
R3
C1
C2
Vout=1.2V to 5V
Vin=2V to 14V
1
2
3
4
5
6
7
8
EN
Vin Vout
PGOOD
FB
GND
NC2NC1
L6932H1.2
R1
R2
R3
C1
C2
Vout=1.2V to 5V
Vin=2V to 14V
1
2
3
4
5
6
7
8
EN
Vin Vout
PGOOD
FB
GND
NC2NC1
L6932H1.2
R1
R2
R3
C1
C2
Vout=1.2V to 5V
Vin=2V to 14V
1
2
3
4
5
6
7
8
EN
Vin Vout
PGOOD
FB
GND
NC2NC1
V
OUT
1.2
R
2
--------
R
1
R
2
+()×=
Components selection L6932H1.2
8/13
6.3 Component part list
7 Components selection
7.1 Input capacitor
The input capacitor value depends on a lot of factors such as load transient requirements,
input source (battery or DC/DC converter) and its distance from the input cap. Usually a
47µF is enough for any application but a much lower value can be sufficient in many cases.
7.2 Output capacitor
The output capacitor choice depends basically on the load transient requirements.
Tantalum, Special Polymer, POSCAP and aluminum capacitors are good and offer very low
ESR values. Multilayer ceramic caps have the lowest ESR and can be required for
particular applications. Nevertheless in several applications they are ok, the loop stability
issue has to be considered (see loop stability section).
Below a list of some suggested capacitor manufacturers
Table 6. Component par list
Reference Part number Description Manufacturer
C1 GRM32ER6C226KE20B 22Uf, 16V MURATA
C2 GRM32ER6C226KE20B 22Uf, 16V MURATA
R1 N.M.
R2 0Ω
R3 100K
Table 7. Suggested capacitor
Manufacturer Type Cap Value (µF) Rated Voltage (V)
MURATA CERAMIC 1 to 47 4 to 16
PANASONIC CERAMIC 1 to 47 4 to 16
TAYO YUDEN CERAMIC 1 to 47 4 to 16
TDK CERAMIC 1 to 47 4 to 16
TOKIN CERAMIC 1 to 47 4 to 16
SANYO POSCAP 1 to 47 4 to 16
PANASONIC SP 1 to 47 4 to 16
KEMET TANTALUM 1 to 47 4 to 16
L6932H1.2 Components selection
9/13
7.3 Loop Stability
The stability of the loop is affected by the zero introduced by the output capacitor. The time
constant of the zero is given by:
This zero helps to increase the phase margin of the loop until the time constant is higher
than some hundreds of nsec, depending also on the output voltage and current.
So, using very low ESR ceramic capacitors could produce oscillations at the output, in
particular when regulating high output voltages (adjustable version).
To solve this issue is sufficient to add a small capacitor (e.g. 1nF to 10nF) in parallel to the
high side resistor of the external divider, as shown in Figure 9.
Figure 9. Compensation network
The thermal resistance junction to ambient of the demoboard is approximately 34°C/W.
This mean that, considering an ambient temperature of 60°C and, a maximum junction
temperature of 150°C, the maximum power that the device can handle is 2.7W.
This means that the device is able to deliver a DC output current of 2A only with a very low
dropout.
T ESR C
OUT
×=
F
ZERP
1
2π ESR C
OUT
××
-----------------------------------------------=
L6932H1.2
R1
R2
R3
C1
C2
Vout=1.2V to 5VVin=2V to 14V
1
2
3
4
5
6
7
8
EN
Vin Vout
PGOOD
FB
GND
NC2NC1
C3
L6932H1.2
R1
R2
R3
C1
C2
Vout=1.2V to 5VVin=2V to 14V
1
2
3
4
5
6
7
8
EN
Vin Vout
PGOOD
FB
GND
NC2NC1
C3
P1-P3P4-P6P7-P9P10-P12P13-P13

L6932H1.2TR

Mfr. #:
Buy L6932H1.2TR
Manufacturer:
STMicroelectronics
Description:
LDO Voltage Regulators Hi performance 2A ULDO Linear Reg
Lifecycle:
New from this manufacturer.
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