参数资料
| 型号： | SC493ULTRT |
| 厂商： | Semtech |
| 文件页数： | 21/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM MLPQ-20 |
| 标准包装： | 1 |
| 系列： | EcoSpeed®, SmartDrive™ |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 3 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-MLPQ |
| 包装： | 标准包装 |
| 其它名称： | SC493ULTRTDKR |
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SC493
Register Map
Address
00h
01h
02h
03h
04h
06h
D7
PGD
0 (1)
0 (1)
0 (1)
0 (1)
0 (1)
D6
DCM
0 (1)
0 (1)
0 (1)
0 (1)
0 (1)
D5
DNS
0 (1)
UPSV0
UPSV1
0 (1)
1 (2)
D4
BO
0 (1)
POD2
SST2
VFBadj4
1 (2)
D3
ILIM
0 (1)
POD1
SST1
VFBadj3
1 (2)
D2
OT
EnIntLd
POD0
SST0
VFBadj2
Margin2
D1
OVO
CLF
Freq1
PSV1
VFBadj1
Margin1
D0
UVO
ENSW
Freq0
PSV0
VFBadj0
Margin0
Access
RO
R/W
R/W
R/W
R/W
R/W
Reset
40h
01h
20h
2Eh
0Fh
3Bh
Description
Status Register
Control Register 1
Control Register 2
Control Register 3
Control Register 4
Control Register 6
Notes:
(1) Always write 0
(2) Always write 1
Definition of Registers and Bits
Status and Flag Bits Description — Register 0
A status bit reflects the current state of the converter. It becomes high when the specified condition has occurred and
turns low when the specified condition has disappeared. A flag bit becomes high when the specified condition has
occurred and will not turn low when the specified condition has disappeared.
Name
UVO
OVO
OT
ILIM
Bit
00h[0]
00h[1]
00h[2]
00h[3]
Definition
Under Voltage Output Flag
Over Voltage Output Flag
Over Temperature Flag
Output Current Limit Flag
Description
Flag bit when high indicates that the output voltage fell below 70% of the regulation level
while being current limited.
Flag bit when high indicates output voltage has been above the regulation level by 20%.
Flag bit when high indicates that the over temperature circuit has tripped.
Flag bit when high indicates that the inductor current threshold has been reached.
Flag bit when high indicates that the FB voltage has fallen below PGD falling threshold (80%)
BO
00h[4]
Brown Out Flag
with the device not in current limit. This normally means the output under voltage has been
caused by low input voltage.
Flag bit when high indicates that the FB voltage did not reach the power good rising thresh-
DNS
00h[5]
Did Not Start Flag
old (90%) within the predetermined time. This time interval is the programmed soft start time.
The power good delay is 10% of the programmed soft start time.
Status bit when high indicates that the part is operating in discontinuous mode. The part is
DCM
00h[6]
Discontinuous Mode
Status
only permitted to operate in DCM if PSAVE or UPSAVE is enabled. The part also enters into
DCM mode before the soft start process is complete. Therefore, in the shut down state and
during the soft start process, this bit is also set.
PGD
00h[7]
Power Good Status
Status bit when high indicates that the PGD pin is not being pulled low and therefore the
output is within regulation by +20%.
21
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