TPS40050-Q1_15 Datasheet, PDF (12/35 Pages) Texas Instruments – WIDE-INPUT SYNCHRONOUS BUCK CONTROLLER

TPS40050ĆQ1
TPS40051ĆQ1
TPS40053ĆQ1
SGLS219A − NOVEMBER 2003 − REVISED MAY 2008
APPLICATION INFORMATION
www.ti.com
+
VIN
−
RA
562 kW
RKFF
182 kW
TPS40050PWP
TPS40051PWP
1 KFF
ILIM 16
CA
470 pF
2 RT
3 BP5
VIN 15
BOOST 14
4 SYNC HDRV 13
5 SGND
SW 12
6 SS
BP10 11
7 VFB
LDRV 10
8 COMP PGND 9
PWP
DA
1N914, 1N4150
Type Signal Diode
Figure 5. Hysteresis for Programmable UVLO
UDG−03034
BP5 AND BP10 INTERNAL VOLTAGE REGULATORS
Start-up characteristics of the BP5 and BP10 regulators over different temperature ranges are shown in
Figures 6 and 7. Slight variations in the BP5 occurs dependent upon the switching frequency. Variation in the
BP10 regulation characteristics is also based on the load presented by switching the external MOSFETs.
INPUT VOLTAGE
vs
BP5 VOLTAGE
6
INPUT VOLTAGE
vs
BP10 VOLTAGE
10
5
110°C
4
3
2
−55°C
25°C
8
6
110°C
4
2
25°C
−55°C
1
0
2
4
6
8
10
12
2
4
6
8
10
12
VIN− Input Voltage − V
VIN− Input Voltage − V
Figure 6.
Figure 7.
12