XC6365_1 Datasheet, PDF (10/23 Pages) Torex Semiconductor – PWM Controllde, PWM/PFM Switchable Step-Down DC/DC Converers

XC6365/XC6366 Series
˙TEST CIRCUITS (Continued)
Circuit 7. XC6365C, XC6366C (when used with a PNP transistor)
Circuit 8. XC6365D, XC6366D (when used with a PNP transistor)
Recommended Components
Tr : XP162A12A6PR (Torex P-channel Power MOSFET)
Please use a PNP transistor where VIN < 2.5V
L : 22ЖH (CR54, SUMIDA, FOSC=300kHz)
47ЖH (CR75, SUMIDA, FOSC=180kHz)
10ЖH (CR54, SUMIDA, FOSC=500kHz)
SD : MA2Q735 (Schottky Diode, MATSUSHITA)
CL :10V, 47ЖF (Tantalum capacitor, NICHICHEMl MCE)
CIN :16V 10ЖF (Tantalum capacitor, NICHICHEMI MCE)
PNP Tr. Type
Tr : 2SA1213 (TOSHIBA)
RB : 500Њ(Adjust according to load and Tr. hFE levels)
CB : 2200pF (Ceramic Type)
Set up so that CBʽ1 / (2К x RB x FOSC x 0.7)
C, D type (soft-start externally set-up)
CSS : 0.033ЖF (Ceramic Capacitor)
RSS : 470kΩ(C type), 330kΩ(D type)
B, D type (FB type)
RFB : Set up so that RFB1 / RFB2 = VOUT – 1
(VOUT = setting output voltage),
RFB1 = RFB2 ʽ 2MЊ
CFB : Set up so that fzfb = 1ʸ(2К x CFB x RFB1) is within
the 0.5 to 20kHz range (10kHz conventional)
Adjustments necessary in respect of L, CL.
e.g. : VOUT = 3.0V
RFB1 = 400kΩ, RFB2 = 200kΩ, CFB = 100pF
10/23