Texas Instruments LM53625 QEVM Series, User Manual, Page: 14 / 23

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14 SNVU526 – May 2016
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LM53625xQEVM and LM53635xQEVM User's Guide
6.7 RESET and GND3 Probe
RESET provides an accurate power good signal with release delay. By default jumper J3 is set to VOUT
and pulls the RESET pin to VOUT through a 100-k
Ω resistor. RESET is an open drain output so it can be
pulled to other external voltage levels by removing jumper J3.
6.8 SYNC and GND3 Probe
By default the IC is running with internal oscillator at 2.1 MHz. There are IC options available with and
without internal spread spectrum modulation. Over the SYNC pin, an external function generator can be
connected to take control of the LM53625 and LM53635’s clock, changing switching frequency. SYNC
function is responsive enough to be used for custom frequency modulation techniques.
6.9 Jumper J1
Jumper J1 sets light load operation mode of the IC. If set to [AUTO-MODE] when lightly loaded the IC
goes automatically into PFM mode operation with fewer switching pulses and higher efficiency. The IC can
be set into forced PWM mode (jumper position is marked
FPWM ) to operate with a constant switching
frequency over the entire load range. This forced FPWM mode of operation will have best load transient
behavior as well because there is no operation mode change during load transient steps.
6.10 Jumper J2
Jumper J2 enables the IC. By default it is set to [EN-VIN] and pulls the enable pin through a 100-k Ω
resistor to Vin. If an external source drives the EN pin then remove jumper J2 and use probe points EN
and GND2 or use a 3-pin wire connector directly plugged over J2.
6.11 Jumper J3
Jumper J3 pulls the open drain RESET output to VOUT through a 100-k Ω resistor. If another RESET
output level is needed use probe point RESET and pullup resistor to external reference voltage and
remove jumper J3.
7 Bill of Materials
Table 3. Bill of Materials
DESIGNATOR QTY VALUE DESCRIPTION PART NUMBER
BIAS, EN, RESET, SYNC 4 Test Point, Miniature, White, TH 5002
C1, C2 2 10 µF CAP, CERM, 10 µF, 50 V, ±10%, X5R, 1206_109 GRM31CR61H106KA12L
Cb 1 0.47 µF CAP, CERM, 0.47 µF, 25 V, ±10%, X5R, 0603 GRM188R61E474KA12D
Cbias, Co4 2 0.1 µF
CAP, CERM, 0.1 µF, 16 V, ±10%, X7R, AEC-Q200 Grade
1, 0603
GCM188R71C104KA37J
Cbulk 1 100 µF
CAP, Aluminum Polymer, 100 µF, 50 V, ±20%, 0.025
Ω
,
AEC-Q200 Grade-2
HHXB500ARA101MJA0G
CF1, CF2 2 4.7 µF
CAP, CERM, 4.7 µF, 50 V, ±20%, X7R, AEC-Q200 Grade
1, 1210
CGA6P3X7R1H475M250AB
CHF1, CHF2 2 0.1 µF
CAP, CERM, 0.1 µF, 16 V, ±10%, X7R, AEC-Q200 Grade
1, 0603
CGJ3E2X7R1C104K080AA
Cin_hf1, Cin_hf2 2 0.047 µF CAP, CERM, 0.047 µF, 50 V, +/- 10%, X7R, 0603 GRM188R71H473KA61D
Co1, Co2 2 22 µF CAP, CERM, 22 µF, 10 V, ±10, X7R, 1206 GRM31CR71A226KE15L
Co3 1 47 µF CAP, CERM, 47 µF, 10 V, ±10, X7R, 1210 GRM32ER71A476KE15L
Cvcc 1 4.7 µF
CAP, CERM, 4.7 µF, 16 V, ±10%, X7R, AEC-Q200 Grade
1, 0805
GCM21BR71C475KA73L
FB1 1 600 Ω Ferrite Bead, 600 Ω at 100 MHz, 4 A, 2220 HI2220P601R-10
GND, GND1, IN+, IN-,
VIN1, VOUT
6 Double Terminal, Turret, TH, Double 1502-2
GND2, GND3, GNDs 3 Black Test Point, Miniature, Black, TH 5001
H1, H2, H3, H4 4
Machine Screw, Round, #4-40 × 1/4, Nylon, Philips
panhead
NY PMS 440 0025 PH