PWM Control, PWM/PFM Switching Control,
Step-up DC/DC Converters
XC9106 / 07 Series
Preliminary
Externally Applied Reference Voltage (Vref)
" FUNCTIONAL SETTINGS
< Output Voltage Setting>
Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based on the values of RFB1
and RFB2. The sum of RFB1 and RFB2 should normally be 2 MΩ or less. The range of reference voltage of the series can be varied externally
from 0.8V to 2.5V.
VOUT = Vref applied voltage x (RFB1 + RFB2) / RFB2
The value of CFB1, speed-up capacitor for phase compensation, should result in fzfb = 1/(2 π × CFB × RFB1) equal to 5 to 30kHz. Adjustments are
required depending on the application, value of inductance (L), and value of load capacity (CL).
fzfb = 30kHz (L=10µH)
fzfb = 20kHz (L=22µH)
fzfb = 10kHz (L=47µH)
RFB1 : 270kΩ
CFB : 20pF
27pF
RFB2 : 30kΩ
(fzfb = 30kHz, L = 10µH)
(fzfb = 20kHz, L = 22µH)
(fzfb = 10kHz, L = 47µH)
56pF
< The use of ceramic capacitor CL >
The circuit of the XC9106/9107 series is organized by a specialized circuit which reenacts negative feedback of both voltage and current. Also by
insertion of approximately 100mΩ of a low and inexpensive sense resistor as current sense, a high degree of stability is possible even using a
ceramic capacitor, a condition which used to be difficult to achieve. Compared to a tantalum condenser, because the series can be operated in a
very small capacity, it is suited to use of the ceramic capacitor which is cheap and small.
" RECOMMENDED COMPONENTS
Tr:
*When a MOSFET is used :
*When a NPN Tr. Is used :
2SD1628 (Sanyo)
2SK2159 (NEC N-Channel Power MOSFET)
Note* : With direct voltages over 4.5V, use the
XP161A11A1PR.
Rb : 500Ω (adjust with Tr's HFE or load)
Cb : 2200pF (ceramic type)
Cb ≤ 1 / (2π × Rb× FOSC × 0.7)
SD:
MA2Q737 (Schottky Diode type, MATSUSHITA)
L, CL :
Adjust as below according to the condition and peripheral components
When Ceramic capacitor is used :
L :
22µH (SUMIDA CDRH5D28, FOSC = 100kHz)
10µH (SUMIDA CDRH5D18, FOSC = 300kHz)
CL :
10V 10µF (Ceramic capacitor, LMK325BJ106ML, TAIYOYUDEN)
Use the formula below when step-up ratio and output current is large.
CL = (CL standard value) × (IOUT(mA) / 300mA × VOUT / VIN)
RSENSE : 100mΩ
50mΩ
(FOSC = 300kHz)
(FOSC = 100kHz)
When Tantalum capacitor is used :
L:
22µH (SUMIDA CDRH5D28, FOSC = 300kHz)
47µH (SUMIDA CDRH5D28, FOSC = 100kHz)
Except when IOUT(mA) / 100mA × VOUT / VIN > 2 → 22µH
16V 47µF (tantalum type NIPPONCHEMI 16MCE476MD2)
Use the formula below when step-up ratio and output current is large.
CL = (CL standard value) × (IOUT(mA) / 300mA × VOUT / VIN)
Not required, but short out the wire.
CL:
RSENSE:
When AL Electrolytic capacitor is used :
L:
22µH (SUMIDA CDRH5D28, FOSC = 300kHz)
47µH (SUMIDA CDRH5D28, FOSC = 100kHz)
Except when IOUT(mA) / 100mA × VOUT / VIN > 2 → 22µH
16V 100µF (AL electrolytic type) + 10V 2.2µF (ceramic type)
Strengthen appropriately when step-up ratio and output current is large.
Not required, but short out the wire.
CL:
RSENSE:
CFB:
Set up so that fzfb = 100kHz.
Semiconductor Ltd.
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