Analog Devices DC2569A, Демонстрационное руководство

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dc2569af
DEMO MANUAL DC2569A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CIN1 CAP.,10µF, X5R, 16V, 20%, 0805 AVX, 0805YD106MAT2A
KEMET, C0805C106M4PAC7800
KEMET, C0805C106M4PACTU
2 1 COUT1, COUT2 CAP., 22µF, X5R, 16V, 20%, 1206 MURATA, GRM31CR61C226ME15L
3 1 COUT3 CAP., 1µF, X5R, 25V, 10%, 0805 AVX, 08053D105KAT2A
4 2 R1, R6 RES., 1MΩ, 1%, 1/10W, 0603 NIC, NRC06F1004TRF
PANASONIC, ERJ3EKF1004V
VISHAY, CRCW06031M00FKEA
5 1 R5 RES., 11k, 1%, 1/10W, 0603 VISHAY, CRCW060311K0FKEA
6 1 U1 IC,Step-Up DC/DC Power Module, LGA-25 LINEAR TECHNOLOGY, LTM4661EV#PBF
Additional Demo Board Circuit Components
1 0 C1, C2, C3 CAP., 0603, OPTION OPT
2 0 R2, R3, R4 RES., OPTION, 0603 OPT
QUICK START PROCEDURE
Figure 6. The DC2569 Ramps the Output Slowly
at Start-Up without Output Voltage Overshoot
500µs/DIV
V
IN
2V/DIV
I
IN
200mA/DIV
RUN
2V/DIV
V
OUT
10V/DIV
4661 G07
V
IN
= 3.3V,
V
OUT
= 12V
f
S
= 1MHz (DEFAULT)
C
OUT
= 2×22µF CERAMIC
OUTPUT SHORT CIRCUIT PROTECTION
The LTM4661 features safe short-circuit and thermal pro-
tection. The part can operate continuously with output
shorted while maintaining a maximum set current limit.
The internal peak switch current is reduced during over-
load to about 2A and is restored to 3.5A once the output
exceeds 1.5V.
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