Texas Instruments TPS43061 Evaluation Module TPS43061EVM-198 TPS43061EVM-198 Datenbogen
Produktcode
TPS43061EVM-198
Time = 5.00 ms/div
5
.0
0
V
/d
iv
5
.0
0
V
/d
iv
C2: VCC
C3: V
OUT
5
.0
0
V
/d
iv
C1: V
IN
5
.0
0
V
/d
iv
C4: PGOOD
Time = 5.00 ms/div
5
.0
0
V
/d
iv
5
.0
0
V
/d
iv
C2: VCC
C3: V
OUT
5
.0
0
V
/d
iv
C1: EN
5
.0
0
V
/d
iv
C4: PGOOD
Time = 1.00 µs/div
2
0
.0
m
V
/d
iv
1
0
.0
V
/d
iv
C2: V
IN
ac coupled
C4: I
L
1
.0
0
A
/d
iv
C1: SW
Time = 1.00 µs/div
2
0
.0
m
V
/d
iv
1
0
.0
V
/d
iv
C2: V
IN
ac coupled
C4: I
L
1
.0
0
A
/d
iv
C1: SW
Test Setup and Results
2.6
Input Voltage Ripple
The EVM CCM input voltage ripple is shown in
. The output current is the rated full load of 2 A
and V
IN
= 9 V. The voltage ripple is measured directly across the input capacitors.
The DCM input voltage ripple is shown in
. The output current is 0.15 A and V
IN
= 9 V.
Figure 10. Input Voltage Ripple CCM
Figure 11. Input Voltage Ripple DCM
2.7
Start Up
The start up waveforms are shown in
and
. The input voltage for these plots is 9 V and
the output has a 2-A resistive load. In
the input voltage supply is turned on and V
IN
begins rising.
Both the VCC and VOUT rail initially rise with V
IN
. When the input reaches the undervoltage lockout
threshold set by the external resistor divider, the device can begin switching and the output ramps up to
the set value of 15 V with the slow-start voltage. PGOOD goes high when VOUT is in regulation.
the set value of 15 V with the slow-start voltage. PGOOD goes high when VOUT is in regulation.
In
the input voltage is applied with EN held low. The output voltage is a diode drop below the
input voltage and VCC is disabled. When EN is released, the start up sequence begins with VCC coming
into regulation and the output ramps up to the set value of 15 V. PGOOD goes high when VOUT is in
regulation.
into regulation and the output ramps up to the set value of 15 V. PGOOD goes high when VOUT is in
regulation.
Figure 12. Start Up Relative to V
IN
Figure 13. Start Up Relative to EN
9
SLVU799A – November 2012 – Revised March 2013
Using the TPS43061 Boost Evaluation Module (EVM)
Copyright © 2012–2013, Texas Instruments Incorporated