参数资料
| 型号： | UC3845BD1G |
| 厂商： | ON Semiconductor |
| 文件页数： | 2/19页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 8-SOIC |
| 标准包装： | 98 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 275kHz |
| 占空比： | 50% |
| 电源电压： | 7.6 V ~ 30 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | 0°C ~ 70°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 其它名称： | UC3845BD1GOS |
UC3844B, UC3845B, UC2844B, UC2845B
MAXIMUM RATINGS
Rating
Bias and Driver Voltages (Zero Series Impedance, see also Total Device spec) (Note 1)
Total Power Supply and Zener Current
Output Current, Source or Sink (Note 2)
Output Energy (Capacitive Load per Cycle)
Current Sense and Voltage Feedback Inputs
Error Amp Output Sink Current
Symbol
V CC , V C
(I CC + I Z )
I O
W
V in
I O
Value
36
30
1.0
5.0
? 0.3 to + 5.5
10
Unit
V
mA
A
m J
V
mA
Power Dissipation and Thermal Characteristics
D Suffix, Plastic Package, SOIC ? 14 Case 751A
Maximum Power Dissipation @ T A = 25 ° C
Thermal Resistance, Junction ? to ? Air
D1 Suffix, Plastic Package, SOIC ? 8 Case 751
Maximum Power Dissipation @ T A = 25 ° C
Thermal Resistance, Junction ? to ? Air
N Suffix, Plastic Package, Case 626
Maximum Power Dissipation @ T A = 25 ° C
Thermal Resistance, Junction ? to ? Air
Operating Junction Temperature
P D
R q JA
P D
R q JA
P D
R q JA
T J
862
145
702
178
1.25
100
+150
mW
° C/W
mW
° C/W
W
° C/W
° C
Operating Ambient Temperature
UC3844B, UC3845B
UC2844B, UC2845B
T A
0 to +70
? 25 to +85
° C
UC3844BV, UC3845BV
? 40 to +105
Storage Temperature Range
T stg
? 65 to +150
° C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. The voltage is clamped by a zener diode (see page 9 Under Voltage Lockout section). Therefore this voltage may be exceeded as long as
the total power supply and zener current is not exceeded.
2. Maximum package power dissipation limits must be observed.
3. This device series contains ESD protection and exceeds the following tests: Human Body Model 4000 V per JEDEC Standard
JESD22-A114B, Machine Model Method 200 V per JEDEC Standard JESD22-A115-A
4. This device contains latch-up protection and exceeds 100 mA per JEDEC Standard JESD78
ELECTRICAL CHARACTERISTICS (V CC = 15 V [Note 5], R T = 10 k, C T = 3.3 nF. For typical values T A = 25 ° C, for min/max values
T A is the operating ambient temperature range that applie s [Note 6], unless otherwise noted.)
U C284x B
UC384xB, xBV, NCV384xBV
Characteristic
Symbol
Min
Typ
Max
Min
Typ
Max
Unit
REFERENCE SECTION
Reference Output Voltage (I O = 1.0 mA, T J = 25 ° C)
Line Regulation (V CC = 12 V to 25 V)
Load Regulation (I O = 1.0 mA to 20 mA)
Temperature Stability
Total Output Variation over Line, Load, & Temperature
Output Noise Voltage (f = 10 Hz to 10 kHz, T J = 25 ° C)
Long Term Stability (T A = 125 ° C for 1000 Hours)
Output Short Circuit Current
V ref
Reg line
Reg load
T S
V ref
V n
S
I SC
4.95
?
?
?
4.9
?
?
? 30
5.0
2.0
3.0
0.2
?
50
5.0
? 85
5.05
20
25
?
5.1
?
?
? 180
4.9
?
?
?
4.82
?
?
? 30
5.0
2.0
3.0
0.2
?
50
5.0
? 85
5.1
20
25
?
5.18
?
?
? 180
V
mV
mV
mV/ ° C
V
m V
mV
mA
OSCILLATOR SECTION
Frequency
T J = 25 ° C
T A = T low to T high
T J = 25 ° C (R T = 6.2 k, C T = 1.0 nF)
f OSC
49
48
225
52
?
250
55
56
275
49
48
225
52
?
250
55
56
275
kHz
Frequency Change with Voltage (V CC = 12 V to 25 V)
Frequency Change w/ Temperature (T A = T low to T high )
Oscillator Voltage Swing (Peak ? to ? Peak)
D f OSC / D V
D f OSC / D T
V OSC
?
?
?
0.2
1.0
1.6
1.0
?
?
?
?
?
0.2
0.5
1.6
1.0
?
?
%
%
V
5. Adjust V CC above the Startup threshold before setting to 15 V.
6. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.
T low = 0 ° C for UC3844B, UC3845B T high = + 70 ° C for UC3844B, UC3845B
= ? 25 ° C for UC2844B, UC2845B = + 85 ° C for UC2844B, UC2845B
= ? 40 ° C for UC384xBV, NCV384xBV =+105 ° C for UC3844BV, UC3845BV
= +125 ° C for NCV384xBV
http://onsemi.com
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| UC3845BD1R2 | 功能描述:电流型 PWM 控制器 52kHz 1A Current PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UC3845BD1R2G | 功能描述:电流型 PWM 控制器 52kHz 1A Current PWM w/48% Duty Cycle Max RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UC3845BDG | 功能描述:电流型 PWM 控制器 52kHz 1A Current PWM w/48% Duty Cycle Max RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| UC3845BDG | 制造商:ON Semiconductor 功能描述:IC CURRENT MODE PWM CTRL 25V SOIC-14 制造商:ON Semiconductor 功能描述:IC, CURRENT MODE PWM CTRL, 25V, SOIC-14 |
| UC3845BDR2 | 功能描述:电流型 PWM 控制器 52kHz 1A Current PWM RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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