NR885K Datasheet, PDF (2/2 Pages) Sanken electric – Surface-Mount, Current Mode Control, Synchronous Rectifier Step-down Switching Mode

■External Dimensions (HSOP8)
Pin 1
Mark
0.695 TYP
5.20
A
1.27
0.40
2.90
Enlarged View of A
0.4
■Block Diagram
2
IN
OSC
Σ
Current
Sense
7
ON/
EN ^OFF
3.5V
P.REG
VREF
0.8V
OCP
Drive
REG
5V
+
PWM
-
LOGIC
5V
TSD
6 NC
UVLO
GND
4
3.5V
10uA
Compensation
-++
Error Amp
0.8V
SS
SS
8
BS
1
SW
3
FB ₅
■Typical Connection Diagram
VIN
C2
R3
2
7
VIN
EN
C10
1
BS 3
L1
SW
C1
NR885K
R4
8
SS
5
FB
GND
NC
R5
4
6
C9
R6
D1
Vout
C4 C5
NR885K
(Unit : mm)
Pin Assignment
q BS
w VIN
e SW
r GND
t FB
y NC
u EN
i SS
*: The heat slug on the rear side is at
the ground potential.
Plastic Mold Package Type
Flammability: UL 94V-0
Product Mass: Approx. 0.1g
C1, C2: 10µF/25V
C4, C5: 22µF/16V
C9: 0.1µF
C10: 0.1µF
L1: 10µH
R3: 20Њ to 47Њ
R4+R5: 5kЊɹɹ(VO=3.3V)
R6: 1.6kЊ
ICs 21