ACE1117C
1A Bipolar Linear Regulator
Typical Application
ACE1117C has an adjustable version and six fixed versions (1.2V, 1.8V, 2.5V, 3.3V, 5.0V and 12V)
Fixed output voltage version
ACE1117C
Application circuit of ACE1117C fixed version
1. Recommend using 10uF tan capacitor as bypass capacitor (C1) for all application circuit.
2. Recommend using 10uF tan capacitor to assure circuit stability.
Adjustable Output Voltage Version
ACE1117C provides a 1.25V reference voltage. Any output voltage between 1.25V~12V can be
achievable by choosing two external resistors (schematic is shown below), R1 and R2
ACE1117C-ADJ
Application Circuit of ACE1117C -ADJ
The output voltage of adjustable version follows the equation: Vout=1.25*(1+R2/R1)+IAdj*R2. We can
ignore IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA).
1. To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower.
As ACE1117C-ADJ can keep itself stable at load current about 2mA, R1 is not allowed to be higher
than 625Ω.
2. Using a bypass capacitor (C
ADJ
) between the ADJ pin and ground can improve ripple rejection. This
bypass capacitor prevents ripple from being amplified as the output voltage is increased. The
impedance of C
ADJ
should be less than R1 to prevent ripple from being amplified. As R1 is normally in
the range of 100Ω~500Ω, the value of C
ADJ
should satisfy this equation:1/(2 *
ripple
*C
ADJ
)<R1.
VER 1.3
6
ACE [ ACE TECHNOLOGY CO., LTD. ]
