MB3881 Datasheet, PDF (23/40 Pages) Fujitsu Component Limited. – 8-ch DC/DC Converter IC with Synchronous Rectifier for Voltage Step-up and Step-down

• CH7
VO
FB7
11
R1
10
−IN7
R2
12
+IN7
20 kΩ
80 kΩ
MB3881
Error
− ^Amp.7
+
+
+
1.25 V
• +IN7 ≥ 1.25 V
VO = ^{1.25 V}
R2
(R1 + R2)
• +IN7< 1.25 V
VO = ^+IN7
R2
(R1 + R2)
SCP
− ^Comp.7
+
+
+
1.0 V
• CH8
VO
FB8
4
R1
5
−IN8
R2
Ra
Rb
6
+IN8
7
−IN8(C)
8
+IN8(C)
VB = 2 V
Error
Amp.8
−
+
VO = ^{2Rb (R1 + R2)}
(Ra + Rb) R2
SCP
− ^Comp.8
+
23