SRP Hitachi Semiconductor, SRP Datasheet - Page 9

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

Electrical Characteristics (cont)
Current Sensing Part
Item
Voltage gain
Maximum sensing voltage
Power supply voltage
rejection ratio
Input bias current
Current sensing
response time
Notes: 1. The gain this case is the ratio of error amplifier output change to the current-sensing threshold
PWM Output Part
Item
Output low voltage 1
Output low voltage 2
Output high voltage 1
Output high voltage 2
Output low voltage at
standby mode
Rise time
Fall time
Maximum ON duty
Minimum ON duty
Notes: 1. Pulse application test
2. Reference value for design.
3. Current sensing response time tpd is definded a shown in the figure 1.
voltage change.
HA17384SPS/SRP, HA17384HPS/HRP, HA17385HPS/HRP
Figure 1 Definition of Current Sensing Response Time tpd
Symbol
V
V
V
V
V
t
t
Du max
Du min
r
f
OL1
OL2
OH1
OH2
OL STB
Symbol
A
Vth
PSRR
I
tpd
BCS
VCS
CS
Min
—
—
13.0
12.0
—
—
—
94
—
(PWM)
V
V
OUT
Min
2.85
0.9
—
—
50
CS
Typ
0.7
1.5
13.5
13.3
0.8
80
70
96
—
Typ
3.00
1.0
70
–2
100
Max
3.15
1.1
—
–10
150
tpd
Max
1.5
2.2
—
—
1.1
150
130
100
0
Unit
V/V
V
dB
ns
A
Unit
V
V
V
V
V
ns
ns
%
%
Vth
Test Condition
V
12 V
V
Time from when V
becomes 2 V to when
output becomes “L” (2 V)
FB
CS
= 0 V
= 2 V
Test Condition
losink = 20 mA
losink = 200 mA
losource = –20 mA
losource = –200 mA
V
losink = 1 mA
C
C
IN
L
L
V
= 1000 pF
= 1000 pF
= 5 V,
IN
25 V
CS
Note
1
1
Note
1
2
3
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