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參數(shù)資料
| 型號(hào)： | NCN6804MNR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 14/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SMART CARD DUAL W/SPI 32-QFN |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 應(yīng)用： | 智能卡 |
| 接口： | 4 線 SPI 串行 |
| 電源電壓： | 2.7 V ~ 5.5 V |
| 封裝/外殼： | 32-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 32-QFN（5x5） |
| 包裝： | 剪切帶 (CT) |
| 安裝類型： | 表面貼裝 |
| 其它名稱： | NCN6804MNR2GOSCT |
NCN6804
http://onsemi.com
21
CRD_VCC Charged
Figure 17. Theoretical DC/DC Operating Waveforms
Ipeak
CRD_VCC
IL
Q5/Q6
Q2/Q3
Q1/Q4
Vripple
CRD_VCC Voltage Regulated
toff
ton
Charge CRD_VCC
Next CRD_VCC Charge
(Time is Not to Scale)
When the CRD_VCC is programmed to zero volt, or when
the card is extracted from the socket, the active pull down Q7
rapidly discharges the output reservoir capacitor, making
sure the output voltage is below 0.4 V when the card slides
across the ISO contacts.
Based on the experiments carried out during the
NCN6804 characterization, the best comprise, at time of
printing this document, is to use two 4.7
mF/10 V/
ceramic/X7R capacitors in parallel to achieve the
CRD_VCC filtering. The ESR will not extend 50 m
W over
the temperature range and the combination of standard parts
provides an acceptable –20% to +20% tolerance, together
with a low cost. Obviously, the capacitor must be SMD type
to achieve the extremely low ESR and ESL necessary for
this application. Figure 18 illustrates the CRD_VCC ripple
observed in the NCN6804 demoboard depending upon the
type of capacitor used to filter the output voltage.
Figure 18. Typical CRD_VCC Ripple Voltage (5 V, 3 V
and 1.8 V) – cms Capacitor COUT = 10 mF, 1210, X7R,
16 V
During the operation, the inductor is subject to high peak
current as depicted Figure 19 and the magnetic core must
sustain this level of current without damage. In particular,
the ferrite material shall not be saturated to avoid
uncontrolled current spike during the charge up cycle.
Moreover, since the DC/DC efficiency depends upon the
losses developed into the active and passive components,
selecting a low ESR inductor is preferred to reduce these
losses to a minimum.
Figure 19. Typical Inductor Current
According to the ISO78163 and EMV specifications, it
is recommended the interface limits the CRD_VCC output
current to 200 mA maximum, under short circuit conditions.
The NCN6804 supports such a parameter, the limit being
depending upon the input and output voltages as depicted
Figure 20.
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