S֙C(j)PDADSCGPSȔ(sh)ayʽa(chn)ƷѸͰl(f)չԼҺ@ʾ켼g(sh)ơɫLCD@ʾԽ(li)Խɞ锵(sh)ayʽa(chn)ƷҪ֙C(j)PDAҲԽ(li)Խ˂ϲgAɫLCD@ʾҪM@ɫʄtҪðɫ鱳СͲɫLCD@ʾðɫLEDԴģ@·(jin)ռgСЧʸr(ji)ͼL(zhng)c(din)ɫLEDVFһɫLEDߣVF=34VɫLEDԴһД(sh)(g)ɫLEDM֙C(j)(sh)aC(j)һH24(g)ɫLEDPDAt(j)@ʾeҪ36(g)(du)ԴҪǣҪM(mn)㱳ҪȾ(Sijһ^һ^r)ȿԷ{(dio)(ji)ȻyʽӮa(chn)ƷPDAGPS(sh)aC(j)һ֙C(j)ȣ늳늉һ3-4.2VҪһ(g)ʽԴ(li)(q)(dng)ɫLEDɫLED(q)(dng)ЃɷN(q)(dng)ʽ
1) ʽ늺ɱ(q)(dng)·ݔ늉Сڃɱݔ늉һݔ늉+5V(q)(dng)LEDķʽDz(lin)D1-aʾ
2) ʽDC/DC׃Q·(li)(q)(dng)ݔ늉13V28Vߣ(q)(dng)LEDķʽǴ(lin)D1-bʾô(lin)ʽʹ^(gu)ÿһ(g)LEDһtl(f)ľԺãò(lin)ʽVFxɢԵӰ푣ڶ늕r(sh)ÿ(g)LEDȶɰl(f)ľԲmȻԲ{(dio)(ji)(li){(dio)(ji)@ʮ韩ЩS_(ki)l(f)(q)(dng)(lin)LEDICIC(ni)пƸ(lin)LEDgܝM(mn)LEDȾҪIC·(f)sɱ^
1-a (lin)LED(q)(dng)
1-b (lin) LED (q)(dng)
SyʽвɫLCD@ʾĮa(chn)Ʒİl(f)չa(chn)ʹͰɫLED(q)(dng)SƷN֮༰(sh)֮ʹɫLED(q)(dng)γԴICеһ(g)Ҫ֧F(xin)ڱyʽa(chn)ƷҲԽ(li)Խ?fn)Խ?li)Խˌ(du)֙C(j)PDADSCȏSҁ(li)Cost downĉҲ^BCD˾(yng)Ј(chng)(li)ƳһNͳɱģ(lin)͵ʽİLED(q)(dng)-AP3008ĹܝM(mn)LCDҪăr(ji)ܝM(mn)͑(h)ͳɱҪĿǰɫLED(q)(dng)?xn)r(ji)^ߵĮa(chn)Ʒ
(lin)LEDc(din)ÿһ(g)LEDILEDһӵ˲ø|(zh)ģͬһ̖(ho)LEDr(sh)l(f)^@BCD˾20058·ƳAP3008(li)f(shu)乤ԭB䑪(yng)·
D 2 AP3008 (ni)Y(ji)(gu)D
AP3008ă(ni)Y(ji)(gu)DD2ʾAP3008ģʽʽDC-DC׃Q1.25VĻ(zhn)`Ŵ1.2MHZʎбl(f)ȡӷŴ·PWM^R/S|l(f)ݔ(q)(dng)_(ki)P(gun)^(gu)o(h)OVPȽM
AP3008(ni)ǷiUVLO·ʹ·ɿЌĹ늉늉2.5V߹늉15V
AP3008(ni)`Ŵla(b)W(wng)j(lu)h(hun)·бa(b)·ʹ·(wn)Ñ(h)ʹ÷dz
^(gu)o(h)OVP·zy(c)PWM}_ݔķֵ늉(dng)PWM}_ķֵ늉ڃ(ni)O(sh)õyֵ늉r(sh)^(gu)o(h)(OVP)·(dng)ʹPWM_(ki)P(gun)· Shutdownʹ·¹Shutdown pinVin pinʩɵ͵ߵ̖(ho)@Nͨ^(gu)IC(ni)O(jin)y(c)PWM}_ķֵ늉(li)_(d)OVPo(h)ķ(yu)ⲿݔ늉IC(ni)O(sh)ֵ^ķ(ni) OVPܲHٲһlھ(xin)߀ɴ_̖(ho)ܸɔ_
`Ŵͬ˅늉95mvЧpСLEDȡēpģݔЧ
^(gu)LEDILEDczy(c)R1(zhn)늉95mvP(gun)P(gun)ϵʽǣ
ILED=95mv/R1
ILEDСһ5 20mA(yng)R1194.7
@eҪĻ(zhn)늉ֱӲ1.25Vǽ(jng)։ȡ95mv@һNpٓpĵĴʩɈD1-bɿ^(gu)LED ILEDX95mvϵēpģR1ϵķ늉95mv1.25vpٵ95mv(13)R1ϵēpϜpС13D(zhun)QЧ
AP3008õĸl36V Bipolerˇ͉h(yun)һЩCMOSˇƳƳɵDC/DC׃Q
D 3
AP3008đ(yng)·D3ʾԓ·һ(g)c(din)ݔ3.2Vr(sh)(q)(dng)4(g)ɫLEDݔ_(d)20mAݔ5Vr(sh)(q)(dng)6(g)ɫLEDݔ_(d)20mAD(zhun)QЧD4ʾILED=15mAr(sh)Чʿ_(d)83%
pСռӡưgĴʩ
ͱyʽӮa(chn)ƷҪߴСpɰɫLED(q)(dng)Mɵı·ҲҪM(mn)@ЩҪAP3008O(sh)Ӌ(j)ϲʎlʵ1.2MHZʹ늸Բ1mm߶ȵNƬʽԪݔݔݿɷքe1uF0.22uF;ԓa(chn)Ʒ SOT23-5TSOT23-5bʹICĸ߶С1.1mm0.9mm;ʹAP 3008·ռgPCBepС
늾W(wng)