SRP Hitachi Semiconductor, SRP Datasheet - Page 21

• Manufacturer Part Number: SRP
• Description: High Speed Current Mode PWM Control IC for Switching Power Supply
• Manufacturer: Hitachi Semiconductor

Rise/Fall Time of Output Pulse vs. Load Capacitance
1.25
1.00
0.75
0.50
0.25
Oscillation Frequency vs. Ambient Temperature
250
Current Sensing Level vs. Ambient Temperature
200
150
100
65
60
55
50
45
40
50
0
0
20
20
0
V
C
V
V
V
V
V
IN
L
IN
CS
FB
IN
FB
Output load capacitance C
= 1000pF
Ambient Temperature Ta ( C)
= 15V
= 15V
Ambient temperature Ta ( C)
= 15V
= 0V
= 0V
= 0V
0
0
1000
HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
Dumax = 95%
Dumax = 40%
20
Measured when COMP terminal
voltage is externally supplied
20
2000
40
40
C
R
60
60
T
T
C
R
Ta = 25 C
C
R
= 3300pF
= 10k
T
T
3000
T
T
= 0.033 F
= 680
= 3300pF
= 10k
80
80
L
(pF)
4000
105
105
Rise/Fall Time of Output Pulse vs. Ambient Temperature
250
200
150
100
Relationship Between Low Voltage Malfunction
25
20
15
10
50
5
0
0
Operating Current vs. Maximum ON Duty
0
20
V
(UVL1)
Vref
(UVL2)
PWM
OUTPUT
Condition
description
V
V
V
V
IN
IN
IN
CS
FB
Maximum ON Duty Du max (%)
= 15V
Ambient temperature Ta ( C)
= 15V
= 0V
= 0V
Protection and PWM Output
0
25
Standby
state
Rise time t
L
L
L
20
Fall Time t
IC is in
the ON
state and
output is
fixed to
LO.
40
50
H
L
L
r
Ta=25 C
C
L
f
= 1000pF
60
Available
to
output
Operation
state
C
C
R
H
H
V
L
T
T
V
75
CS
FB
= 1000pF
= 3300pF
= 10k
80
= 0V
= 0V
Standby
state
H
L
L
100
105
21