Fairchild AN-7008 FPF200X Evaluation Module User Manual

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AN-7008 FPF200X Evaluation Module

Introduction Hard short: where the output is pulled down directly to ground (set J1 as shown in Figure 1)

The FPF200X EVM is an Evaluation Module for Fairchild Semiconductor FPF2000 smart load switches family. The

Extra space has been left on the board beside R and C if

FPF200X family is a 0.7 PMOS load switches with

user should want to mount and experiment with a special

controlled turn-on, fast turn-off, and current limit. The

load (for example an inductive load).

current Limit is guaranteed for 50m A and 100m A with 1.8V to 5.5V range of input voltage.

Monitoring the FLAGB (TP1) The Evaluation Module has test points for convenient access The status of the FLAGB pin can be monitored through TP1 to the all pins and jumpers for setting the various load either by probing it or by lighting a small LED in current conditions along with switches for toggling the ON/OFF and limit events. (J2 needs to be set as shown in figure1)

configuring the ON pin polarity. The Board can be presented

as a stand alone unit with a 1.8-5.5V battery for testing the For non-Auto-Restart parts the LED stays lit in current limit basic functions. conditions until the SW2 switch is toggled. For Auto-Restart parts, the LED will light as long as the pushbottom switch (SW1) is being held down.

Current-Limit Condition The Output current can be sensed by removing R3 = 0 and

ON Pin

soldering a loop across it.

TP2 for monitoring the status of the ON pin

The FPF200X EVM can demonstrate the current condition

SW2 for manual ON/OFF switching

stand alone (Nominal, Hard- short and Moderate over- current) through SW1 or by using an external pulse Ext. ON for activating the ON pin by external pulse generator generator through the EXT. over-current terminal. The three

load conditions are as follows: This may be useful for testing the switching characteristics of the switch.

Nominal load: for normal operation with R = 500

and C = 0.1 F. SW3 for setting the ON pin polarity

Moderate over-current: where the output is pulled down LO for FPF2001 and FPF2005 by a 10 resistor to ground (set J1 as shown in Figure 1) HI for FPF2000,2002,2003,2004,2006,2007

snoitidno C timi L tnerru C :1J

t Conditionnerru C rev O lanretn I :1WS t = Vout/10uo I tnerruc revo etaredo M .1 tnerru C tuptu O gnisne S

n set by J1oitidnoc tnerruc-revo sesua C out = 0V)V( trohs dra H.2 R3 = 0Ω and eht evome R

yb tnerruc tuptuo eht esnes ti ssorc pool a gniredlos

tnerru C rev O lanretx E :3PT

lortnoc lanretxe na gnignahc y B nip NO eht serugifno C :3WS 3PT hguorht htdiw eslup langis )o L ro IH evitc A( ytiralo P

rotarene G noitcnu F a gnisu rof htdiw eslup eht yrav dna

knalb T eh T gnitset tratser T dna

nip NO :2PT

NO lanretx E :4PT FFO/NO eht lortno C yb hctiws fo etats gnisu :1PT nip BGALF

noitcnu F a rotarene G )B noitisop ni 2J tup tsri F(

hctiw S FFO/NO :2WS eht sesaeler lliw 2WS gnilggo T noitiso P BGALF :2J edom ffo-hctal morf hctiws dao L DEL gnisu :A

1PT evitca :B 2J

Figure 1. FPF200X Evaluation Module Board

© 2004 Fairchild Semiconductor REV. A 12/21/04