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参数资料
| 型号： | SI9145BY-T1-E3 |
| 厂商： | Vishay Siliconix |
| 文件页数： | 8/14页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM VM 16-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 2MHz |
| 占空比： | 100% |
| 电源电压： | 2.7 V ~ 7 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -25°C ~ 85°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
Si9145
Vishay Siliconix
PIN CONFIGURATIONS
SOIC-16
Product is End of Life 3/2014
V DD
1
16
V S
TSSOP-16
MODE SELECT
D MAX /SS
COMP
FB
NI
2
3
4
5
6
15
14
13
12
11
OUTPUT
P GND
UVLO SET
ENABLE
OTS
V DD
MODE SELECT
D MAX /SS
COMP
FB
NI
V REF
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V S
OUTPUT
P GND
UVLO SET
ENABLE
OTS
C OSC
R OSC
V REF
GND
7
8
10
9
C OSC
R OSC
Top View
Top View
ORDERING INFORMATION - SOIC-16
ORDERING INFORMATION - TSSOP-16
Part Number
Si9145BY-T1
Si9145BY-T1-E3
Temperature Range
- 25° to 85 °C
Part Number
Si9145BQ-T1
Si9145BQ-T1-E3
Temperature Range
- 25° to 85 °C
PIN DESCRIPTION
Pin 1: V DD
The positive power supply for all functional blocks except
output driver. A bypass capacitor of 0.1 μF (minimum) is rec-
ommended.
Pin 2: MODE SELECT
This pin is used to enable maximum duty cycle limit and set
output polarity of controller. When connected to V DD , the
maximum duty cycle function is controlled by the D MAX /SS
pin. The maximum duty cycle limit is usually used for forward,
flyback, and boost converters. The output polarity is high
when the PWM circuitry requires the external device to be
turned on.
When connected to GND, the maximum duty cycle is not lim-
ited (usually for buck converters driving a P-Channel MOS).
The output polarity is low when the PWM circuitry requires
the external PMOS to be turned on.
Pin 3: D MAX /SS
D MAX /SS pin controls the maximum duty cycle achievable by
the PWM circuitry when the MODE SELECT = V DD .
When D MAX /SS is at less than 1.0 V (typical) the OUTPUT is
held low (0 % duty cycle). When D MAX /SS is at more than
1.5 V (typical), the PWM circuitry can achieve 100 % duty
cycle. With voltage at D MAX /SS between 1.0 V and 1.5 V, the
maximum duty cycle is proportionally limited to this voltage.
www.vishay.com
8
The addition of external components can implement a soft
start function.
Pin 4: COMP
This pin is the output of the error amplifier. A compensation
network is connected from this pin to the FB pin to stabilize
the system. This pin drives one input of the internal pulse
width modulation comparator.
Pin 5: FB
The inverting input of the error amplifier. External resistors
are connected to this pin to set the regulated output voltage.
The compensation network is also connected to this pin.
Pin 6: NI
The non-inverting input of the error amplifier. In normal oper-
ation it is externally connected to the V REF pin.
Pin 7: V REF
This pin supplies 1.5 V trimmed to ± 1.5 %. The reference
voltage is generated by a band-gap reference.
Pin 8: GND
Negative return for V DD .
Document Number: 70021
S-40710-Rev. K, 19-Apr-04
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