TLD5095EL Infineon Technologies, TLD5095EL Datasheet - Page 9

• Manufacturer Part Number: TLD5095EL
• Description: IC DC-DC CTRLR BUCK BOOST 14SSOP
• Manufacturer: Infineon Technologies

Specifications of TLD5095EL

• Constant Current: Yes
• Constant Voltage: Yes
• Topology: PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: No
• Type - Primary: Automotive
• Frequency: 100kHz ~ 500kHz
• Voltage - Supply: 4.75 V ~ 45 V
• Voltage - Output: 4.6 V ~ 5.4 V
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP Exposed Pad, 14-eTSSOP 14-HTSSOP
• Internal Switch(s): *
• Efficiency: *
• Packages: PG-SSOP-14
• Vs (min): 4.75 V
• Vs (max): 45.0 V
• Vq (max): -
• Iq (max): -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Current - Output / Channel: -
• Lead Free Status / Rohs Status: Details

5
5.1
The TLD5095 regulator is suitable for boost, buck-boost and SEPIC configurations. The constant output current
is especially useful for light emitting diode (LED) applications. The boost regulator function is implemented by a
pulse width modulated (PWM) current mode controller.
The PWM current mode controller uses the peak current through the external power switch and error in the output
current to determine the appropriate pulse width duty cycle (on time) for constant output current. The current mode
controller it provides a PWM signal to an internal gate driver which then outputs the same PWM signal to external
n-channel enhancement mode metal oxide field effect transistor (MOSFET) power switch.
The current mode controller also has built-in slope compensation to prevent sub-harmonic oscillations which is a
characteristic of current mode controllers operating at high duty cycles (>50% duty).
An additional built-in feature is an integrated soft start that limits the current through the inductor and external
power switch during initialization. The soft start function gradually increases the inductor and switch current over
1 ms (typical) to minimize potential overvoltage at the output.
Figure 3
Datasheet
COMP
FREQ/
SYNC
OVFB
FBH
FBL
0.3V
V
Boost Regulator
Description
Boost Regulator Block Diagram
Ref
Oscillator
x1
=
1.25V
V
Ref
Soft start
=
OV FB
I
Slope Comp
EA
H when
OVFB >1.25V
gmEA
t
I
EA
Current
Comp
Low when
T
High when
l
EA
j
> 175 °C
- I
SLOPE
Clock
- I
CS
R
S
> 0
Error -FF
9
&
&
OFF
when H
Q
Q
NOR
>
1
High when
IVCC < 4.0V
Output Stage
OFF when
Low
NAND 2
&
R
S
PWM-FF
&
&
UV IVCC
Q
Q
=
TLD5095
V
4.0V
Ref
INV
1
I
CS
Rev. 1.1, 2009-12-16
Current
Sense
Gate Driver
Boost Regulator
Supply
Gate
Driver
TLD5095EL
IVCC
SWO
SWCS
SGND