TLD5098EL Infineon Technologies, TLD5098EL Datasheet - Page 10

• Manufacturer Part Number: TLD5098EL
• Description: IC DC-DC CTRLR BUCK BOOST 14SSOP
• Manufacturer: Infineon Technologies

Specifications of TLD5098EL

• Constant Current: Yes
• Constant Voltage: Yes
• Internal Driver: No
• Type - Primary: Automotive
• Mounting Type: Surface Mount
• Topology: PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Frequency: 100kHz ~ 500kHz
• Voltage - Supply: 4.5 V ~ 45 V
• Voltage - Output: 4.5 V ~ 5.5 V
• Package / Case: 14-LSSOP (0.150", 3.95mm Width) Exposed Pad
• 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: -
• Lead Free Status / Rohs Status: Details

5
5.1
The TLD5098EL regulator is suitable for boost, buck-boost and SEPIC configurations. The constant output current
is especially useful for light emitting diode (LED) applications. The 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 provides a PWM signal to an internal gate driver which then outputs to an 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
t
Figure 3
Datasheet
SS
FREQ/
SYNC
COMP
OVFB
(Parameter 5.2.9) to minimize potential overvoltage at the output.
FBH
SET
FBL
10
8
11
9
6
7
(
SET −
Boost Regulator
Description
Boost Regulator Block Diagram
0 if SET < 1.6V
5
V
1 . 0
Oscillator
V
Ref
V
)
x1
0
=
1
1.25V
V
0.3V
V
Ref
Ref
=
OV FB
Soft start
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
10
&
&
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
=
V
4.0V
Ref
INV
1
I
CS
Rev. 1.0, 2010-10-13
Current
Sense
Gate Driver
Supply
Gate
Driver
Boost Regulator
TLD5098EL
1
2
4
3
IVCC
SWO
SWCS
SGND