Datasheet

Gate Drive
8- sOne-Shotm
S
S
EN
EN
PWM
Comparator
HSD
PWM Latch
S
R
Q
INPUT
LSD
Iind
V + 5%
AUX
V – 2%
AUX
PFM Latch
S
R
Q
I 4.5 A
SW
AUXHigh
Comparator
PFM Enter
Comparator
AUXLow
Comparator
IIND
420mA
LOW
Constant-Current
Start-up Comparator
V – V
IN AUX
V700mV
EXIT
+
+
+
+
+
+
+
+
+
–
–
V
IN
V 5.05V
NFM
+
–
–
–
–
–
–
–
–
–
+
Error
Amplifier
Slope
Compensation
Generator
I
6.7 A
UPPER
1-MHz/250-kHz
Oscillator
LowerCurrent-
LimitComparator
UpperCurrent-
LimitComparator
85%Max
DutyCycle
Generator
I
2.65 A
START
Constant-Current
Start-up Amplifier
B0352-01
V
IN
V
4.35V
LFM
V V
V
IN LFM
³ ® 250kHz
<V 1MHz
IN LFM
®
R
L
C
L
OUT
TestCircuit
10%
90%
10%
90%
V
OUT
t
on
t
off
10%
90%
50%50%
V
EN
50% 50%
10%
90%
VoltageWaveforms
t
r
t
f
V
OUT
V
EN
V
OUT
t
on
t
off
S0395-01
TPS2500, TPS2501
SLVS886C –OCTOBER 2008–REVISED AUGUST 2010 www.ti.com
Figure 1. Detail of Boost Control Circuitry
PARAMETER MEASUREMENT INFORMATION
Figure 2. Test Circuit and Voltage Waveforms
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