LTC3786_15 Datasheet, PDF (30/34 Pages) Linear Technology – Low IQ Synchronous Boost Controller

LTC3786
Applications Information
DANGER HIGH VOLTAGE! OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY
VBIAS
SENSE⁺
25k
f_SW = 105kHz
C_SS
0.1µF
C_ITH
22nF
R_ITH
8.66k
C_ITHA
100pF
16.2k
1%
LTC3786
SENSE^–
PLLIN/MODE
RUN
FREQ
TG
SS
SW
BOOST
ITH
BG
INTV_CC
GND
VFB
100k
PGOOD
1M 1M 1.5M
1% 1%
1%
10nF
R_SENSE
15mΩ
T
D
1:10
•
22Ω
•
220pF
MBOT
C_INT
4.7µF
C_IN: TDK C3225X7R1C226M
C_OUT: TDK C3225X7R2J683K
D: VISHAY SILICONIX GSD2004S DUAL DIODE CONNECTED IN SERIES
MBOT: VISHAY SILICONIX Si7850DP
T: TDK DCT15EFD-U44S003
C_IN
22µF
×2
C_OUT
68nF
×2
V_IN
5V TO 12V
V_OUT
350V
10mA
3786 F15
Figure 15. Low I_Q High Voltage Flyback Power Supply
30
VBIAS
SENSE⁺
LTC3786
SENSE^–
C_SS 0.1µF
C_ITH
22nF
R_ITH
8.66k
C_ITHA 100pF
PLLIN/MODE
RUN
TG
FREQ
SW
SS
BOOST
BG
ITH
INTV_CC
12.1k
1%
VFB
232k
1%
GND
100k
PGOOD
R_SENSE
6mΩ
L
10µH
D
MBOT
C_INT
4.7µF
C_IN, C_OUTA: MURATA GRM31CR61E106KA12
C_OUTB: KEMET T495X476K035AS
D: ON SEMI MBRS340T3G
L: VISAY SILICONIX IHLP-5050FD-01 10µH
MBOT: VISHAY SILICONIX Si4840BDP
C_IN
10µF
×2
V_IN
5V TO 24V
C_OUTA ⁺
10µF
C_OUTB
47µF
×4
V_OUT
24V
2A
3786 F15
Figure 16. Low I_Q Nonsynchronous 24V/2A Boost Converter
3786fa