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参数资料
| 型号： | LT3804EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM 28-TSSOP |
| 标准包装： | 2,000 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 570kHz |
| 占空比： | 80% |
| 电源电压： | 8 V ~ 25 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： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3804
APPLICATIO S I FOR ATIO
Filtering on the SYNC Input
A small RC filter with R S = 10k and C S = 10pF is necessary
on the SYNC pin to eliminate fast switching glitches
caused by coupling from external components and layout
parasitics.
Optocoupler Driver
Optocoupler driver OA1 is an amplifier with a fixed gain of
6 and can source up to 10mA into the optocoupler. An
external resistor is needed from the OPTO pin to the
optocoupler for DC biasing the optocoupler. With a unique
0.3V hysteresis on the threshold V TH , OA1 turns into a
comparator when it detects output startup or output short.
This comparator action jumpstarts the optocoupler to
reduce the output overshoot drastically (see Figure 3).
Soft-Start and Shutdown First Output
During soft-start, V SS1 is the reference voltage that con-
trols the output voltage, so the output ramps up following
V SS1 . The effective range of V SS1 is from 0V to V REF1 . The
To shut down the first output, the SS1 pin should be pulled
below 50mV by a small signal VN2222 type N-channel
MOSFET.
Soft-Start and Shutdown Second Output
During soft-start, V SS2 is the reference voltage that con-
trols the output voltage, so the output ramps up following
V SS2 . The effective range of V SS2 is from 0V to V REF2 . The
typical time for the output to reach the programmed level
is:
t = (CSS2 ? 0.6V)/10 μ A
During start up, BGATE will stay off until V SS2 reaches
1.6V. This prevents the bottom MOSFET from turning on
if the output is precharged. To shut down the second
output, the SS2 pin should be pulled below 50mV by a
small signal VN2222 type N-channel MOSFET. Note that
during shutdown BGATE will be locked off when V SS2
drops below 0.6V. This prevents the bottom MOSFET from
discharging the output, which could cause the output to
undershoot below ground.
typical time for the output to reach the programmed level
is:
t = (CSS1 ? 0.6V)/10 μ A
V OUT1
5nF
R13
22nF
470 ?
1k
2.7k
3.3V
V OUT1
SHORT
STARTUP
OR SHORT
RELEASE
V AOUT1
V FB1
V OUT1
OPTO
1k
R OPTO
OPTO
OA1
90k
1.5V/
1.2V V TH
15k
V A1
R14
600 ?
1.7V
V AOUT1
1.4V
1.5V
V TH
1.2V
V REF1
0.6V
V OPTO
2V
LT3804
GNDS1
0V
3804 F03
Figure 3. Optocoupler Driver
3804i
9
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