NB650/NB650H – 6A, 28V, FAST-TRANSIENT, SYNCHRONOUS STEP-DOWN CONVERTERS
R3
4.7
3
11
17
BST
SW
IN
V
IN
R7
205k
1, 2
FREQ
R5
100k
V
OUT
C4
R4
C7
1nF
NB650
NB650H
274k
330pF
Cdc
R1
12.1k
5
8
EN
13
100nF
FB
VCC
R6
100k
R2B
147k
R2A
16.9k
R2C
73.2k
R10
R11
14
15
1Meg
1Meg
RFB2
RFB1
4
PG
6
VID1
VID2
16
7
SS
C6
100nF
SW1
PGND
9, 10
GND
12
Figure 14: Typical Application Circuit with Low-ESR Ceramic Capacitor and DC-Blocking Capacitor
VIN =12V, VOUT = 1.05/1.10/1.15/1.20V, IOUT = 6A, fSW = 550kHz
R3
4.7
3
11
17
BST
SW
IN
V
IN
R7
300k
1, 2
FREQ
R5
100k
V
OUT
C4
R4
C7
1nF
NB650
NB650H
340k
330pF
R9
R1
5.76k
5
8
EN
13
0
FB
VCC
R6
100k
R2B
34.8k
R2A
97.6k
R2C
23.2k
R10
R11
14
15
1Meg
1Meg
RFB2
RFB1
4
PG
6
VID1
VID2
16
7
SS
C6
100nF
SW1
PGND
9, 10
GND
12
Figure 15: Typical Application Circuit
VIN = 19V, VOUT = 0.65/0.75/0.80/0.90V, IOUT = 6A
NB650/NB650H Rev. 1.12
10/11/2012
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18
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