TLD5085EJ Infineon Technologies, TLD5085EJ Datasheet - Page 11

• Manufacturer Part Number: TLD5085EJ
• Description: IC DC-DC CONV STP-DWN 1.8A DSO8
• Manufacturer: Infineon Technologies

Specifications of TLD5085EJ

• Constant Current: Yes
• Constant Voltage: Yes
• Topology: PWM, Step-Down (Buck), Switched Capacitor (Charge Pump)
• Number Of Outputs: 1
• Internal Driver: *
• Type - Primary: Automotive
• Frequency: 370kHz
• Voltage - Supply: 4.75 V ~ 45 V
• Voltage - Output: 0.6 V ~ 16 V
• Mounting Type: Surface Mount
• Package / Case: DSO-8
• Current - Output / Channel: 1.8A
• Internal Switch(s): *
• Efficiency: *
• Packages: PG-DSO-8
• Vs (min): 4.75 V
• Vs (max): 45.0 V
• Vq (max): -
• Iq (max): 1,800.0 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Lead Free Status / Rohs Status: Details

8
Note: The following information is given as a hint for the implementation of the device only and shall not be
8.1
The stability of the output voltage can be achieved with a simple RC connected between pin COMP and GND. The
standard configuration using the switching frequency of the internal oscillator is a ceramic capacitor
and
types of buck capacitors (ceramic or tantalum).
The compensation network is essential for the control loop stability. Leaving pin COMP open might lead to an
instable operation.
8.2
The TLD5085EJ control loop is optimized for ceramic buck capacitors
tantalum capacitors with ESR up to 300mΩ, an additional compensation capacitance
is required. It’s value calculates:
whereas
Figure 4
8.3
In order to minimize losses and for fast recovery, a schottky freewheeling diode is required. Disconnecting the
freewheeling diode during operation might lead to destruction of the IC.
Datasheet
R
regarded as a description or warranty of a certain functionality, condition or quality of the device.
COMP
C
COMP2
= 22kΩ. By slight modifications to the compensation network the stability can be optimized for different
Application Information
Frequency Compensation
Compensating a tantalum buck capacitor
High-ESR buck capacitor compensation
Freewheeling Diode
needs to stay below 5nF.
C
COMP2
C
COMP2
C
R
COMP
COMP
=
C
BU
COMP
*
ESR
11
3
(
C
BU
) /
TLD5085
R
C
COMP
2
BU1
GND
C
Application _C-COMP2.vsd
BU
,
. In order to maintain stability also for
C
COMP2
Application Information
Rev. 1.1, 2009-12-16
at pin COMP to GND
TLD5085EJ
C
COMP
= 22nF