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參數(shù)資料
| 型號(hào)： | SP6121 |
| 英文描述： | Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| 中文描述： | 低電壓，為第2A同步降壓PWM控制器的理想下至10A，占地面積小，DC - DC電源轉(zhuǎn)換器 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 358K |
| 代理商： | SP6121 |
Date: 5/25/04
SP6121 Low Voltage, Synchronous Step Down PWM Controller Copyright 2004 Sipex Corporation
3
PIN DESCRIPTION
PIN NO.
1
PIN NAME DESCRIPTION
V
CC
Positive input supply for the control circuitry and gate drivers. Properly bypass this pin
to GND with a low ESL/ESR ceramic capacitor.
GND
Ground pin. Both power and control circuitry of the IC is referenced to this pin.
V
FB
Feedback Voltage Pin. It is the inverting input of the Error Amplifier and serves as the
output voltage feedback point for the buck converter. The output voltage is sensed and
can be adjusted through an external resistor divider.
COMP
Output of the Error Amplifier. It is internally connected to the non-inverting input of the
PWM comparator. A lead-lag network is typically connected to the COMP pin to
compensate the feedback loop in order to optimize the dynamic performance of the
voltage mode control loop. Sleep mode can be invoked by pulling the COMP pin below
0.2V with an external open-drain or open-collector transistor. Supply current is reduced
to 25
μ
A (typical) in shutdown. An internal 5
μ
A pull-up ensures start-up.
I
SENSE
Current Limit Sense pin. Connect this pin to the switching node at the junction between
the two external power MOSFET transistors. This pin monitors the voltage dropped
across the R
of the high side P-channel MOSFET while it is conducting. When
this drop exceeds the sum of the voltage programmed through the I
pin plus the
internal 160mV threshold, the overcurrent comparator sets the fault latch and termi-
nates the output pulses. The controller stops switching and goes through a hiccup
sequence. This prevents excessive power dissipation in the external power MOSFETs
during an overload condition. An internal delay circuit prevents that very short and mild
overload conditions, that could occur during a load transient, activate the current limit
circuit.
I
SET
Current Limit Threshold pin. An external resistor connected between this pin and the
source of the high side P-channel MOSFET adds to the internal current limit threshold
of 160mV. If a current limit threshold in excess of 160mV is required, the external
programming resistor can properly be chosen based on the internal 30
μ
A pull down
current available on the I
pin. Both this 30
μ
A current source and the 160mV built-in
current limit threshold have a positive temperature coefficient to provide first order
correction for the temperature coefficient of the external P-channel MOSFET’s R
DS(ON)
.
NDRV
High current driver output for the low side MOSFET switch. It is always low if PDRV is
low or during a fault.
PDRV
High current driver output for the high side MOSFET switch. It is always high if NDRV
is high or during a fault.
2
3
4
5
6
7
8
ELECTRICAL SPECIFICATIONS: Continued
Unless otherwise specified: 0
°
C < T
A
< 70
°
C, 3.0V < V
CC
< 5.5V, C
COMP
= 22nF, C
PDRV
= C
NDRV
= 3.3nF, V
FB
= 1.25V, I
SET
= I
SENSE
= V
CC
, GND=0V
PARAMETER
SOFT START, SHUTDOWN, UVLO: continued
Shutdown Threshold Voltage
Shutdown Input Pull-up Current
V
CC
Start Threshold
V
CC
Stop Threshold
V
CC
Hysteresis
GATE DRIVERS
PDRV Rise Time
PDRV Fall Time
NDRV Rise Time
PDRV Fall Time
PDRV to NDRV Non-Overlap Time
NDRV to PDRV Non-Overlap Time
MIN
TYP
MAX
UNITS CONDITIONS
0.2
0.3
5
2.79
2.69
100
0.4
V
μ
A
V
V
mV
Measured at COMP Pin
COMP = 0.2V, Measured at COMP pin
2.69
2.59
-
2.89
2.79
-
-
-
-
-
40
40
40
40
80
50
110
110
110
110
ns
ns
ns
ns
ns
ns
V
CC
> 4.5V
V
CC
> 4.5V
V
CC
> 4.5V
V
CC
> 4.5V
V
CC
> 4.5V
V
CC
> 4.5V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP6121CN | Low Voltage, Synchronous Step Down PWM Controller Ideal for 2A to 10A, Small Footprint, DC-DC Power Converters |
| SP6121EB | Demo Board Manual |
| SP6132H | High Voltage, 300KHz Synchronous PWM Controller |
| SP6132HEU | High Voltage, 300KHz Synchronous PWM Controller |
| SP6134 | Dual Supply Synchronous Buck Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP612-10 | 制造商:Delphi Corporation 功能描述:TORSION SPRING |
| SP6121CN | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Low Voltage, 8 Pin Synchronous, Cntrllr RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6121CN/TR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Low Voltage, 8 Pin Synchronous, Cntrllr RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6121CN-L | 功能描述:電壓模式 PWM 控制器 Low Voltage, 8 Pin Synchronous, Cntrllr RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| SP6121CN-L/TR | 功能描述:電壓模式 PWM 控制器 Low Voltage, 8 Pin Synchronous, Cntrllr RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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