- 您现在的位置：买卖IC网 > PDF目录1841 > MAX1961EEP+ (Maxim Integrated Products)IC REG CTRLR BUCK PWM VM 20-QSOP PDF资料下载
参数资料
| 型号： | MAX1961EEP+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 19/29页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 20-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.12MHz |
| 占空比： | 90% |
| 电源电压： | 2.35 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-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页当前第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页
2.35V to 5.5V, 0.5% Accurate, 1MHz PWM
Step-Down Controllers with Voltage Margining
FEEDBACK DIVIDER
ERROR AMPLIFIER
MODULATOR
OUTPUT FILTER
V 1
0.8V
R1
R2
Gm
R3
V IN /V RAMP
R S
L1
C9
V 2
Figure 7. Open-Loop Transfer Model
R ESR
C OUT
R LOAD
(4) Gate threshold voltage (V TH(MIN) )
(5) Turn-on/turn-off times
(6) Turn-on/turn-off delays
At high switching rates, dynamic characteristics (para-
meters 1, 2, 5, and 6) that predict switching losses may
have more impact on efficiency than R DS(ON) , which pre-
dicts DC losses. Q G includes all capacitance associated
with charging the gate, and best performance is
achieved with a low total gate charge. Q G also helps
predict the current needed to drive the gate at the
selected operating frequency. This is very important
because the output current from the charge pump is
finite (50mA, max) and is used to drive the gates of the
MOSFETs as well as provide bias for the IC. R DS(ON) is
important as well, as it is used for current sensing in the
MAX1960/MAX1961. R DS(ON) also causes power dissi-
pation during the on-time of the MOSFET.
Choose Q G to be as low as possible. Ensure that:
Choose R DS(ON) to provide the desired I LOAD(MAX) at
the desired current-limit threshold voltage (see the
Setting the Current Limit section).
MOSFET RC Snubber Circuit
Fast-switching transitions can cause ringing due to res-
onating circuit parasitic inductance and capacitance at
the switching nodes. This high-frequency ringing
occurs at LX rising and falling transitions, and may
introduce current-sensing errors and generate EMI. To
dampen this ringing, a series RC snubber circuit can
be added across each MOSFET switch (Figure 8).
Typical values for the snubber components are C SNUB
= 4700pF and R SNUB = 1 ? , however, the ideal values
for snubber components will depend on circuit para-
sitics. Below is the procedure for selecting the compo-
nent values of the series RC snubber circuit:
1) Connect a scope probe to measure V LX to GND,
and observe the ringing frequency, f R .
2) Find the capacitor value (connected from LX to
GND) that reduces the ringing frequency by half.
Q G 1 + Q G 2 ≤
50mA
f S
3) The circuit parasitic capacitance, C PAR , at LX is then
equal to 1/3 of the value of the added capacitance
above.
______________________________________________________________________________________
19
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1964TEEE+ | IC POWER CTRLR/SEQUENCER 16QSOP |
| MAX1967EUB+T | IC REG CTRLR BUCK PWM VM 10-UMAX |
| MAX1969EUI+T | IC DRVR POWER 28-TSSOP |
| MAX1971EEE+T | IC REG BUCK SYNC 0.75A DL 16QSOP |
| MAX1973EUB+T | IC REG BUCK SYNC ADJ 1A 10UMAX |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1961EEP+ | 功能描述:DC/DC 开关控制器 1MHz PWM Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1961EEP+T | 功能描述:DC/DC 开关控制器 1MHz PWM Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1961EEP-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1962EEP | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1962EEP+ | 功能描述:DC/DC 开关控制器 1MHz PWM Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
发布紧急采购，3分钟左右您将得到回复。