Datasheet

SW
Ramp
Generator
Oscillator
Current
Sensor
EN
PGND
C4
L1
+
EA
R2
C2
VIN
PWM Control
COMP
R1
R3
R4
C3
SS
FREQ SYNC
FB
FB
Gate
Driver
C1
AGND
D1
1.229 V
Reference
TPS61175
www.ti.com SLVS892B –DECEMBER 2008–REVISED FEBRUARY 2012
FUNCTIONAL BLOCK DIAGRAM
TYPICAL CHARACTERISTICS
TABLE OF GRAPHS
Circuit of Figure 1; L1 = D104C2-10μH; D1 = SS3P6L-E3/86A, R4 = 80kΩ, R3 = 10kΩ, C4 = 22nF,
FIGURE
C2 = 10μF;Vin = 5V, Vout = 24V, Iout = 200mA; unless otherwise noted
Efficiency VIN = 5V, Vout = 12V, 24V, 35V 2
Efficiency VIN = 5V, 12V; Vout = 24V 3
Error amplifier transconductance vs Temperature 4
Switch current limit vs Temperature 5
Switch current limit vs Duty cycle 6
FB accuracy vs Temperature 7
Line transient response Vin = 4.5 V to 5 V 8
Load transient response Iout = 100 mA to 300 mA; refer to 'compensating the control loop' for optimization 9
PWM Operation 10
Pulse skipping No load 11
Start-up C3 = 47 nF 12
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