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参数资料
| 型号： | SRP |
| 厂商： | Hitachi,Ltd. |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | High Speed Current Mode PWM Control IC for Switching Power Supply |
| 中文描述： | 高速开关电源电流模式PWM控制IC |
| 文件页数： | 11/31页 |
| 文件大小： | 144K |
| 代理商： | SRP |
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HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
11
Timing Chart
Waveform timing (Outline)
Signal Name
Input voltage
V
IN
Pin 7
UVL1
Internal signal which
cannot be externally
monitored.
Reference voltage
Vref Pin 8
UVL2
Internal signal which
cannot be externally
monitored.
Oscillation voltage of
triangular wave
R
T
/C
T
Pin 4
Start up signal
Internal signal which
cannot be externally
monitored.
PWM latch setting signal
internal signal which
cannot be externally
monitored.
Error amplifier input signal
V
FB
Pin 2
Error amplifier output signal
V
*1
Pin 1
I
D
OVP latch signal
Internal signal which
cannot be externally
monitored.
Power ON
IC turn ON
Stationary operation
OVP input
OVP latched
condition
Power OFF
Reset of
OVP latch
Start up latch
release
( ) shows the case
using HA17385H
PWM output voltage
V
OUT
Pin 6
Note: 1. I
D
indicates the power MOSFET drain current; it is actually observed as voltage V
S
generated
by power MOSFET current detection source resistance R
S
.
V
COMP
indicates the error amp output voltage waveform. Current mode operation is
performed so that a voltage 1/3 that of V
COMP
is the current limiter level.
10 V
(7.6 V)
7.0 V
2 V
16 V
(8.4 V)
2 V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
5 V
4.7 V
2.8 V
1.2 V
7.0 V typ
(OVP input)
V
COMP
I
D
V
IN
4.7 V
IC operates and
PWM output stops.
This voltage is determined
by the transformer
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