3
dc1198bbfa
DEMO MANUAL DC1198B-B
LOAD CURRENT (A)
0
60
EFFICIENCY (%)
80
2
4
8
6
100
70
90
10
DC1198BB F03
V
IN
= 6V
V
IN
= 12V
V
IN
= 32V
QUICK START PROCEDURE
Figure 3. Measured Supply Effi ciency
with Different V
IN
Figure 4. Measured Load Transient Response
(2.5A Step, 25% to 75%)
200μs/DIV
V
O(AC)
100mV/DIV
I
STEP
2A/DIV
DC1198BB F04
V
IN
= 6V, V
OUT
= 12V
CONTINUOUS CURRENT MODE (CCM)
1.25A TO 3.75A LOAD STEP
C
OUT
= 2
w
22μF CERAMIC (1812, X7R, 16V),
2
w
180μF OSCON 16V
V
O
OVERSHOOT AND UNDERSHOOT = 413mV
Table 1. Recommended Inductors for Different Input and Output Conditions: f
SW
= 400kHz
V
IN
(V)
V
OUT
(V)
R
SENSE
(0.5W RATING)
INDUCTOR
(μH)
I
OUT(MAX)
*
(A)
INDUCTOR
12
8
2 × 18mΩ, 0.5W
2.2
12
FDA1254-2R2M Toko
CDEP134-2R5 Sumida
20
8
2 × 18mΩ, 0.5W
3.3
12
FDA1254-3R3M Toko
CDEP145-3R5 Sumida
5
10
2 × 14mΩ, 0.5W
1.5
6
FDA1254-1R2M Toko
CDEP134-1R6 Sumida
15
10
2 × 18mΩ, 0.5W
2.2
12
FDA1254-2R2M Toko
CDEP134-2R5 Sumida
20
10
2 × 18mΩ, 0.5W
3.3
12
FDA1254-3R3M Toko
CDEP145-3R5 Sumida
6
12
2 × 14mΩ, 0.5W
2.2
6
FDA1254-2R2M Toko
CDEP134-2R5 Sumida
16
12
2 × 18mΩ, 0.5W
2.2
12
FDA1254-2R2M Toko
CDEP134-2R5 Sumida
20
12
2 × 18mΩ, 0.5W
3.3
12
FDA1254-3R3M Toko
CDEP145-3R5 Sumida
5
16
2 × 14mΩ, 0.5W
2.2
4
FDA1254-2R2M Toko
CDEP134-2R5 Sumida
8
16
2 × 18mΩ, 0.5W
3.3
5
FDA1254-3R3M Toko
CDEP145-3R5 Sumida
12
16
2 × 22mΩ, 0.5W
3.3
6
FDA1254-3R3M Toko
CDEP145-3R5 Sumida
20
16
2 × 22mΩ, 0.5W
2.5
10
FDA1254-2R2M Toko
CDEP134-2R5 Sumida
* Note: Per the manufacturer’s specifi cation sheet, Toko FDA1254 inductors are not recommended for V
IN
> 30V. Please visit Toko’s website for
more information.
Table 2. R
SENSE
Vendors
R
SENSE
VENDOR
PART NUMBER
Vishay
Power Metal Strip Resistors WSL1206, 0.5W
Panasonic
Thick Film Chip Resistors ERJ12, 0.5W
