参数资料
| 型号： | NCP5215MNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 15/21页 |
| 文件大小： | 0K |
| 描述： | IC CTLR SYNC BUCK DUAL 40-QFN |
| 产品变化通告： | Product Discontinuation 01/Oct/2008 |
| 标准包装： | 2,500 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 4.5 V ~ 24 V |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 3 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-VFQFN 裸露焊盘 |
| 供应商设备封装： | 40-QFN（6x6） |
| 包装： | 带卷 (TR) |
NCP5215
applications, to compensate measurement error caused by
temperature, an additional resistance network including a
negative ? temperature ? coefficient (NTC) thermistor can
If an additional current sensing resistor (R CS ) is employed
to improve accuracy, as shown in Figure 32, the load line
resistance can be calculated by
be connected with C CS in parallel.
R LL + R CS Gain_CS @
(eq. 6)
R DRP_ext V O0
@
R DRP_int ) R DRP_ext V REF
The AVP function can be easily disabled by shorting
VDRP pin and VREF pin together.
Control Logic
The internal control logic is powered by V CC . Figure 33
shows a power ? up and powerdown timing diagram for
each channel. Figure 34 shows a state diagram for each
channel.
The NCP5215 continuously monitors V CC and V IN level
with an undervoltage lockout (UVLO) function. If both
Figure 31. Programmable AVP with Lossless Inductor
Current Sensing
V CC and V IN are in operation range, and output voltage is
below 0.3 V, the converter has a soft ? start after ENBL
signal goes high. The soft ? start time is programmed by an
external capacitor C SS connected from the SS Pin to
AGND, which can be calculated by
t SS +
0.8
C SS
I SS
(eq. 7)
where I SS is a sourcing current output from the SS pin.
When the ENBL goes low, or the internal fault latch is set
by over current or output undervoltage, the device operates
in soft stop and output discharge mode. The output is
discharged to GND through an internal 12 W switch
connected from the CS ? /Vo pin to the PGND Pin, until the
output voltage decreases to 0.3 V. Also if restart the system
when the output voltage is still above 0.3 V, the device will
Figure 32. Figure 32. Programmable AVP with
Resistive Current Sensing
discharge the output voltage to 0.3 V first and then start
soft ? start.
The output voltage with AVP is
V O + V O0 * I O @ R LL
(eq. 3)
Overcurrent Protection (OCP)
The NCP5215 protects power system if overcurrent
occurs. The current through each channel is continuously
V O0 + 1 ) @ V REF
where I o is load current, no ? load output voltage V O0 is set
by the external resistor divider, that is
R FO
(eq. 4)
R FG
monitored with the differential current sense. Current limit
threshold is related to an external voltage at the I LIM pin,
which is normally produced by an external resistor divider
(R il1 and R il2 ) connected from the V REF pin to AGND. The
current ? limit threshold for peak current is set by
R FO is a resistor connected between the output and the FB
pin, and R FG is a resistor connected between the FB Pin to
AGND. The load ? line impedance R LL by the AVP function
is given by
I LIM(Peak) + 0.2 @
or
R il2 @ V REF
R il1 ) R il2 @ DCR
(eq. 8)
R DRP_int ) R DRP_ext
V REF
(eq. 5)
R DRP_ext V O0
R LL + DCR Gain_CS @ @
where DCR is DC resistance of the inductor, Gain_CS is a
gain from [(CS+) ? (CS ? )] to (VDRP ? VREF), R DRP_int is a
internal resistance connected between the output reference
and the VDRP Pin, R DRP_ext is a external resistance
connected between the output reference and the VDRP pin.
R il2 @ V REF
I LIM(Peak) + 0.2 @ (eq. 9)
R il1 ) R il2 @ R CS
If inductor current exceeds the current threshold
continuously, the top gate drive will be turned off
cycle ? by ? cycle. In the meanwhile, an internal fault timer
will be triggered to count normal operation clock. After 16
continuous clock pulses, if the fault still exists the part
latches off, both the top gate drive and the bottom gate drive
http://onsemi.com
15
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