LTC3850-1_15 Datasheet, PDF (19/38 Pages) Linear Technology – Dual, 2-Phase Synchronous Step-Down Switching Controller

APPLICATIONS INFORMATION
LTC3850/LTC3850-1
V_OUT1
V_OUT2
V_OUT1
V_OUT2
TIME
38501 F03a
(5a) Coincident Tracking
TIME
38501 F03b
(5b) Ratiometric Tracking
Figure 5. Two Different Modes of Output Voltage Tracking
V_OUT1
TO
TK/SS2
PIN
R3 R1
TO
TO
V_FB1 V_FB2
PIN
PIN
R4 R2
V_OUT2
R3
R4
(6a) Coincident Tracking Setup
V_OUT1
TO
TK/SS2
PIN
R1
TO
TO
V_FB1
V_FB2
PIN
PIN
R2
V_OUT2
R3
R4
38501 F06
(6b) Ratiometric Tracking Setup
Figure 6. Setup for Coincident and Ratiometric Tracking
D1
TK/SS2
0.8V
V_FB2
I
I
+
D2
EA2
–
D3
38501 F07
Figure 7. Equivalent Input Circuit of Error Amplifier
38501fc
19